Wadi Recipe: North India’s Fermented Sun-Dried Lentil Cakes

Every North Indian kitchen has a jar of wadi somewhere. Not necessarily visible — maybe pushed to the back of a shelf behind the dal containers and the masala boxes, or hanging in a cloth bag in a cool corner. But it’s there. Wadi are small, hard, spiced lentil cakes that are fermented, shaped, and sun-dried to shelf-stability, and they’ve been a staple of North Indian pantry management for as long as there have been North Indian pantries.

The concept is elegant in its practicality: urad dal (black gram) is soaked, ground into a batter, fermented overnight to develop flavor and improve digestibility, seasoned with regional spices, dropped or piped into small mounds, and then dried in the sun for 3–5 days until completely hard. The finished wadi can sit at room temperature for 4–6 months without refrigeration, making them one of the most impressive pre-industrial food preservation technologies in Indian cooking. When needed, they’re tossed into curries or dal, where they absorb liquid and transform from dry, hard cakes into soft, richly flavored, protein-packed chunks.

The Bengali call them “bori,” the Maharashtrians call them “vadi,” Rajasthanis know them as “mangodi,” and in Hindi-speaking Punjab and Haryana they’re simply wadi. The same fundamental technique — fermented lentil batter shaped and sun-dried — appears across the subcontinent with regional spice variations that speak volumes about how a single preservation technology adapts to local tastes.

Where Wadi Comes From and Why It Exists

In pre-refrigeration North India, the summer months — May through September — created genuine food storage challenges. Lentils and legumes, the primary protein source for most of the population, could be stored dry indefinitely. But fresh legume preparations spoiled quickly in the heat. The genius of wadi was to transform the protein-rich urad dal into a shelf-stable form that could be cooked from any time of year, no fresh grinding or soaking required on the day of cooking.

The autumn wadi-making season — October through November, when the monsoon has ended and strong sunshine returns — was a significant household production event in traditional North Indian life. Large batches were made by families together, with women grinding soaked urad dal on heavy stone grinders (silbatta), mixing in the year’s spice crop from the kharif harvest, and spreading hundreds of small wadi on reed mats or rooftops to dry in the autumn sun. The making of wadi signaled the end of the rainy season and the beginning of preparation for winter — stored alongside dried ginger, sun-dried fenugreek, and amla (Indian gooseberry) as pantry staples.

The fermentation component wasn’t designed as a health practice — it emerged from practical observation that overnight-rested urad batter tasted better, cooked better, and was easier to digest than freshly ground batter. We now understand why: the LAB that colonize the ground lentil batter overnight reduce raffinose and stachyose — the complex oligosaccharides responsible for the flatulence that unfermented legumes reliably produce — while simultaneously reducing phytic acid (which blocks mineral absorption) and producing B vitamins including riboflavin and niacin.

Research by Vijayalakshmi and Urooj (2013) in the Journal of Food Science and Technology quantified these effects in fermented urad-based preparations: 10–15 hours of fermentation at room temperature reduced phytic acid by 30–45% and improved in vitro protein digestibility by approximately 20% compared to unfermented dal. The microorganisms responsible, as characterized by Sarkar et al. (2012), are predominantly Lactobacillus fermentum, Leuconostoc mesenteroides, and Pediococcus pentosaceus — a standard South Asian fermentation consortium that appears across dosa, idli, dhokla, and now wadi.

Wadi Variations Across North India

Before the recipe, it’s worth appreciating the regional diversity, because wadi is genuinely one of those foods where the same technique produces dramatically different results depending on local spice culture.

Punjab/Haryana wadi tends to be mild and aromatic: cumin seeds, coriander, a modest amount of dried green chili, and sometimes ajwain (carom seeds). The flavor is nutty and herbal, with the fermented urad as the dominant note. These are typically small, marble-sized, and used in wet curries with onion-tomato masala.

Rajasthani mangodi is the most widely known version outside India — small, sun-dried, and typically found in “mangodi ki sabzi” (mangodi curry). Rajasthani versions lean on fennel seeds, dried red chili, and black pepper. The result is more assertively spiced and slightly smaller than Punjabi wadi.

Bengali bori are often made without spice — pure fermented urad batter dropped in small beads and dried, then deep-fried as a snack or floated in mustard-based fish curries where they soak up the complex sauce. Bengali bori also sometimes incorporates moong dal alongside the urad.

Maharashtrian vadi goes in a completely different direction: sometimes including dried coconut, red chili, and coriander, producing a more tropical flavor profile. Some vadi preparations in Maharashtra also incorporate chickpea flour (besan) alongside urad for a denser texture.

What You’ll Need

Core Ingredients (Makes approximately 200–250 wadi)

• 300g (1½ cups) urad dal (white/skinned black gram): Use the skinned, split or whole variety — it’s labeled “urad dal” at Indian grocery stores and is white or cream-colored when husked. The black-skinned whole black gram (sabut urad) can be used but produces darker, slightly more bitter wadi. The skinned white variety is traditional for most North Indian wadi.
• 1½ teaspoons cumin seeds: Foundation spice; slightly crush in a mortar before adding.
• 1 teaspoon coriander seeds, lightly crushed: Earthy counterpart to the cumin.
• ½–1 teaspoon dried red chili flakes or 2 dried red chilies, crushed: Adjust to your heat tolerance.
• ½ teaspoon asafoetida (hing): Essential in most North Indian wadi recipes. It adds an onion-garlic depth and, interestingly, further reduces the flatulence potential of the lentils through its prebiotic compounds.
• Salt to taste (about 1–1.5 teaspoons): Not too much — the wadi will reduce in size as they dry, concentrating the salt.
• Water: Only enough to soak and grind — the batter should be thick, not runny.

Optional Regional Additions

• Fennel seeds (½ tsp): Rajasthani tradition; adds anise-adjacent sweetness.
• Ajwain/carom seeds (¼ tsp): Thyme-like flavor, also aids digestion.
• Dried fenugreek leaves (kasuri methi, 1 tsp): Bitter-herb note popular in Punjab.
• Grated fresh ginger (1 tbsp): Adds warmth; works particularly well in wet curry applications.

Equipment

• Large bowl for soaking
• Blender or wet grinder (wet grinder produces more authentic, airy texture)
• Large mixing bowl
• Piping bag with a small round tip, OR two spoons, OR a zip-lock bag with corner snipped for piping
• Baking sheets, trays, or reed mats lined with parchment paper or oiled cloth
• Direct sunlight — this is the essential drying element

How to Make Wadi: Step-by-Step

Step 1: Soak the Urad Dal (8–12 Hours)

Wash the urad dal thoroughly until the water runs clear. Cover with plenty of cold water (dal expands significantly) and soak for 8–12 hours or overnight. When ready, the dal will have swollen and softened — a single grain should crush easily between your fingers.

Soaking also begins the process of reducing antinutrients before fermentation takes over. Don’t rush this step: inadequately soaked dal grinds unevenly and produces wadi with grainy texture.

Step 2: Grind to a Fluffy Batter

Drain the soaked dal thoroughly. Transfer to a blender (or wet grinder for best results) and grind with minimal water — add just a tablespoon at a time, only as much as needed to keep the blade moving. The goal is a very thick, paste-like batter that is NOT pourable. It should be stiff enough that when you drop a spoonful on a plate, it holds its shape rather than spreading.

The key technique: aerate the batter. After grinding, beat it vigorously with your hand or an electric beater for 3–5 minutes. This incorporates air bubbles, creating a lighter, crispier wadi texture after drying. Traditional stone-ground batter achieves this naturally through the grinding process; blender batter benefits significantly from this extra beating step.

Step 3: Ferment Overnight (6–12 Hours)

Transfer the aerated batter to a large bowl, cover with a clean damp cloth, and leave at room temperature (ideally 24–28°C) for 6–12 hours. The batter will rise slightly, develop a mildly sour smell, and tiny bubbles will be visible on the surface. This is your LAB fermentation at work.

Don’t ferment longer than 12 hours or in temperatures above 30°C — the batter can over-ferment and become too sour for pleasant wadi. Taste the batter before proceeding: it should be very mildly tangy, barely detectably sour. If it’s aggressively sour, reduce fermentation time in future batches.

Step 4: Season and Mix

Add all your spices — cumin, coriander, chili, asafoetida, and salt — to the fermented batter and mix thoroughly. Taste and adjust. The batter should be pleasantly savory with clear spice character. If the batter has loosened during fermentation, it may need to be chilled briefly to return to a pipeable consistency.

Step 5: Shape the Wadi

This is where technique matters. You want consistent small rounds — marble to grape-sized — that will dry uniformly. Options:

• Piping bag method: Fill a piping bag with a 1cm round tip and pipe small rounds directly onto oiled or parchment-lined trays, lifting the tip sharply after each to create a rounded top.
• Spoon method: Use two small spoons (like demitasse spoons) to drop small mounds. This is the traditional home technique — less uniform but perfectly functional.
• Zip-lock method: Fill a zip-lock bag, snip a small corner, and pipe.

Space wadi about 1.5 cm apart on the tray — they don’t expand during drying, but you need airflow around each one. A 300g dal batch typically produces 200–250 individual wadi.

Step 6: Sun-Dry for 3–5 Days

This is the most weather-dependent step and the reason wadi-making is traditionally done in autumn and winter (after monsoon) rather than in summer (when it’s too humid) or rainy season. The wadi need:

• Direct sunlight for at least 6–8 hours per day
• Low humidity (below 60% relative humidity is ideal)
• Airflow to prevent moisture from collecting on the underside

Bring trays inside at night (to avoid dew) and return them to the sun each morning. After 3 days, test a wadi: it should be completely hard, with no soft center when you press it. Snap one in half — it should break cleanly like a dry cracker, with no give. If the center is still soft after 5 days, your drying conditions aren’t ideal — try a dehydrator (40°C for 12–16 hours) as a fallback.

Oven drying as alternative: Set your oven to its lowest temperature (50–60°C) with the door propped open 2 cm for airflow. Dry for 8–12 hours, flipping the wadi halfway through. The result is identical in flavor to sun-dried; the texture is sometimes slightly less porous. This works well in humid climates where sun-drying is impractical.

Step 7: Store Properly

Fully dried wadi store in an airtight container at room temperature for 4–6 months. They must be completely dry before storage — any residual moisture and they’ll mold within a week. If in doubt, extend the drying time. A properly dried wadi is effectively desiccated and will last reliably until the next batch-making season. Store away from direct light to preserve the spice character.

How to Cook with Wadi

Wadi Ki Sabzi (Wadi Curry) — The Classic

Heat 2 tablespoons oil in a heavy pan. Fry the dry wadi for 2–3 minutes until lightly golden — they puff slightly and develop a nutty aroma. Remove and set aside. In the same oil, cook a base of cumin seeds, diced onion, garlic, ginger, diced tomato, and your masala spices (coriander, cumin, red chili, garam masala) until fragrant and well cooked. Add a splash of water, return the fried wadi, cover, and simmer for 15–20 minutes. The wadi absorb the curry sauce and transform from hard pellets to soft, flavorful chunks. Finish with fresh coriander and a squeeze of lemon.

Added to Dal

Toss a handful of wadi directly into simmering yellow dal (toor or moong) in the last 15 minutes of cooking. They add texture and protein while absorbing the dal’s flavor. Particularly good in Rajasthani panchmel dal.

Deep Fried as Snack

Bengali bori-style: deep fry dry wadi in hot oil for 2–3 minutes until puffed, golden, and crisp. Drain and sprinkle with chaat masala. Serve as a snack or garnish on khichdi. The contrast of crisp exterior and soft interior (from steam within the fried wadi) is genuinely delicious and unlike anything else.

In Mustard-Based Preparations

In Bengali cooking, bori are floated in jhol (thin, mustard-seed-tempered gravy) with vegetables or fish. The wadi soften in the liquid without disintegrating, adding body and protein to what would otherwise be a thin sauce.

Troubleshooting

Wadi turning soft and moldy during storage

Not fully dry before storing. Return to the sun or oven for another day, then store only when a snap test confirms complete dryness. Also check that your storage container is genuinely airtight — moisture infiltration from a loose lid is the second most common cause.

Batter too runny after fermentation

Over-fermented (too long or too warm) or too much water was added during grinding. Refrigerate the batter for 30–60 minutes to firm it up before piping. Or mix in a tablespoon of chickpea flour (besan) to absorb excess moisture without significantly changing flavor.

Wadi breaking apart when frying

Usually a grinding issue — batter wasn’t smooth enough, or not aerated enough before fermentation. Beat more aggressively in the next batch. Also ensure the oil is hot enough before adding wadi — frying in oil that’s too cool causes them to soak oil rather than crisp quickly.

Frequently Asked Questions

What are wadi?

Wadi are small, fermented, spiced urad dal (black gram) cakes that are shaped and sun-dried to shelf-stability in North Indian cooking. The urad dal batter ferments overnight to improve nutrition and flavor, is seasoned with regional spices, dropped into small rounds, and dried for 3–5 days until hard. They’re cooked from dry in curries and dal, where they soften and absorb sauce.

What does wadi taste like?

In their dry state, nutty and savory with clear spice character (cumin, coriander, a hint of chili) and a very mild background tang from fermentation. When cooked into curry, they become soft and deeply savory — absorbing all the sauce flavors while contributing their own lentil-umami depth. The texture when cooked is closer to paneer than to cooked dal: firm enough to hold its shape in a spoon, soft enough to yield cleanly.

Can I substitute another lentil for urad dal?

Urad dal’s specific starch composition and protein content is what gives wadi their characteristic texture — both the airy beaten batter stage and the hardness when dried. Moong dal can be used (Bengali bori sometimes use moong) but produces a slightly softer, less crisp result. Chana dal (split chickpea) produces a denser, more crumbly wadi. Urad dal is the preferred choice and is worth sourcing specifically for this recipe.

What is the difference between wadi and papad?

Related but distinct. Papad (papadum) is also a dried urad dal preparation, but it’s rolled extremely thin and crisps immediately when fried or roasted. Wadi is thicker, dried to hardness (not crispness), and intended to be cooked slowly in liquid where it softens and absorbs flavor. Papad crisps in seconds; wadi needs 15–20 minutes of simmering to reach its eating state.

Can I make wadi indoors without sun?

Yes, using an oven at 50–60°C with the door slightly ajar for 8–12 hours. Results are functionally identical to sun-dried, though the texture is occasionally slightly denser. A food dehydrator set to 40°C for 12–16 hours also works well. The drying needs to be slow and thorough — quick high heat creates a hard exterior that traps moisture inside.

How do I know when wadi are fully dry?

Snap test: a fully dry wadi should break cleanly and crisply, with no bend and no soft center. The interior should look uniformly dry with no color difference between surface and core. If it bends before breaking or the center looks slightly darker, it needs more drying time.

Worth the Shelf Space

Wadi represent something unusual in home fermentation: a product that gets better with time after the fermentation is complete. A jar of fully dried wadi made in October is still excellent in March, and some cooks swear the flavor deepens during storage as the spices meld and the slight sourness from fermentation integrates fully into the dried lentil.

Making wadi requires two to three days of attention spread across a week — grinding, fermenting, shaping, drying — but the actual active work is perhaps two hours total. The rest is waiting: waiting for fermentation, waiting for the sun to do its work, waiting for the snap test. And the payoff is a pantry staple that handles protein on any weeknight when the fridge is bare and the spice shelf is full. This is exactly the kind of ingredient that makes North Indian cooking so sustainably practical — nothing wasted, maximum nutrition preserved, maximum flavor developed.