Fermented Shrimp Paste: Complete Guide to Belacan, Saeujeot, and Asian Umami

Fermented shrimp paste is one of the culinary world’s great umami secrets – a powerfully savory ingredient that transforms dishes across Southeast Asia and Korea. A small amount adds depth, complexity, and that hard-to-describe “something” that makes Asian cuisines so craveable. Made from tiny shrimp or krill fermented with salt, these pastes concentrate ocean umami into an ingredient that’s intense, funky, and absolutely essential to understanding regional Asian cooking.

While the strong aroma can shock the uninitiated, fermented shrimp paste is rarely eaten directly. Instead, it’s a background player – toasted and blended into sambal, simmered into curries, hidden in kimchi, or wok-fried to create aromatic bases for countless dishes. This guide covers the major varieties, their traditional uses, and how to incorporate this umami powerhouse into your cooking.

Understanding Fermented Shrimp Paste

What Is Fermented Shrimp Paste?

Fermented shrimp paste is made from small shrimp or krill that have been salted, fermented, and processed into paste form. The fermentation breaks down proteins into amino acids (particularly glutamate – the source of umami taste), creating an intensely savory seasoning.

The process varies by region but generally involves:

1. Mixing tiny shrimp or krill with significant amounts of salt
2. Allowing fermentation under tropical sun and heat
3. Grinding or pounding into paste
4. Aging for additional flavor development
5. Sometimes drying into blocks or cakes

Why Shrimp Paste Is So Powerfully Flavored

The intense flavor comes from several factors:

• Protein breakdown: Enzymes break shrimp proteins into free amino acids, especially glutamate (umami)
• Concentration: Water evaporates during fermentation and drying, concentrating flavors
• Maillard-like reactions: Chemical reactions between amino acids and sugars create complex flavor compounds
• Bacterial metabolism: Fermentation bacteria produce unique aroma compounds

The Smell Factor

Let’s address it directly: fermented shrimp paste smells strong. Very strong. Raw, it can smell fishy, funky, even off-putting to the uninitiated. This is completely normal and doesn’t indicate spoilage. The smell mellows dramatically when cooked, transforming into appetizing savory aroma. If you’ve enjoyed dishes at Thai, Malaysian, or Korean restaurants, you’ve eaten shrimp paste – you just didn’t smell it raw.

Major Types of Fermented Shrimp Paste

Belacan (Malaysian/Indonesian)

Pronunciation: buh-LAH-chan

Characteristics: Sold in blocks or pressed cakes. Dark pink to brownish color. Very firm, dry texture that must be toasted before use. Strongest aroma of the shrimp pastes.

How it’s made: Tiny shrimp (usually Acetes or “geragau”) are mixed with salt and fermented under tropical sun for weeks to months. The mixture is periodically turned and further dried. Finished belacan is pressed into blocks.

Traditional uses:

• Sambal belacan (toasted belacan ground with chilies, lime, and aromatics)
• Nasi lemak condiment
• Curry pastes and laksa
• Kangkung (water spinach) stir-fries
• Numerous Malay and Nyonya dishes

Preparation tip: Always toast belacan before using – wrap in foil and heat over flame or dry-fry until fragrant. This mellows the raw smell and develops flavor.

Kapi (Thai)

Pronunciation: GAH-pee

Characteristics: Softer and more moist than belacan. Dark grayish-purple to black color. Strong but slightly less intense than belacan. Often sold in jars.

How it’s made: Small shrimp are salted and fermented, then pounded smooth. Thai kapi tends to have shorter fermentation than Malaysian belacan, resulting in lighter color and slightly milder flavor.

Traditional uses:

• Essential in Thai curry pastes (red, green, massaman, etc.)
• Nam prik (Thai chili dips)
• Pad Thai (authentic recipes use kapi)
• Tom yum and many Thai soups
• Khao cluk kapi (Thai rice dish)

Preparation tip: Kapi can be added directly to curry pastes or stir-fries without pre-toasting, though toasting intensifies flavor.

Saeujeot (Korean)

Pronunciation: SEH-oo-jut

Characteristics: Not a paste but salted fermented shrimp (whole or slightly broken). Pink to grayish color. Milder and less funky than Southeast Asian pastes. Very salty.

How it’s made: Fresh tiny shrimp are heavily salted (typically 20-30% salt by weight) and fermented in crocks for months. The shrimp remain relatively intact rather than becoming paste.

Traditional uses:

• Essential in traditional kimchi (provides umami and aids fermentation)
• Dipping sauce for pork dishes (samgyeopsal)
• Seasoning for jjigae (stews)
• Namul (vegetable side dishes)

Note: Korean cuisine also uses “saeu-jeot” to refer to the brine liquid, which is used separately as a seasoning.

Mam Tom/Mam Ruoc (Vietnamese)

Pronunciation: mahm-TOM / mahm-rook

Characteristics: Purple-gray paste, quite wet and loose. Strong funky aroma. Mam tom is thicker; mam ruoc is thinner.

Traditional uses:

• Essential in bun bo Hue (spicy beef noodle soup)
• Dipping sauces for spring rolls
• Banh trang nuong (Vietnamese pizza)
• Various central and southern Vietnamese dishes

Bagoong Alamang (Filipino)

Characteristics: Ranges from pink (fresher) to purple-gray (more fermented). Chunkier texture with visible shrimp pieces. Sometimes sweetened or sautéed with garlic and tomatoes.

Traditional uses:

• Condiment with kare-kare (oxtail stew)
• Green mango dipping sauce
• Ginisang bagoong (sautéed with garlic and pork)
• Pinakbet (vegetable stew)

Selecting and Storing Shrimp Paste

Where to Buy

• Asian grocery stores: Best selection and freshest products
• Southeast Asian or Korean markets: For specific regional varieties
• Online retailers: Good for harder-to-find varieties
• Some mainstream supermarkets: Limited selection in Asian sections

What to Look For

• Belacan: Firm blocks, uniform color, no mold, aromatic but not rancid
• Kapi: Consistent texture, not dried out, proper purple-gray color
• Saeujeot: Shrimp pieces visible, submerged in liquid, pink to gray color

Storage Guidelines

• Belacan blocks: Wrap tightly in plastic, store airtight at room temperature (lasts months) or refrigerate (lasts indefinitely). Can also freeze.
• Kapi and softer pastes: Refrigerate after opening in tightly sealed container. Lasts 6+ months refrigerated.
• Saeujeot: Always refrigerate. Lasts months to a year properly stored.

Important: Store shrimp paste in airtight containers to prevent its smell from permeating your refrigerator. Double-bagging is not overkill.

Cooking with Fermented Shrimp Paste

Basic Principles

• Use sparingly: A little goes a long way – start with less, add more if needed
• Toast hard pastes: Belacan and firm pastes benefit from toasting first
• Blend into pastes: Works best incorporated into curry pastes, sambals, or aromatics
• Cook to mellow: Raw smell transforms into appetizing aroma when heated
• Balance with acid: Lime juice, tamarind, or vinegar balance the intensity

Recipe: Classic Sambal Belacan

The essential Malaysian condiment – spicy, sour, and deeply savory.

Ingredients

• 1-inch cube belacan, toasted
• 8-10 fresh red chilies (or to taste)
• 4 shallots
• 2 garlic cloves
• Juice of 2-3 limes (or calamansi)
• 1 teaspoon sugar
• Salt to taste

Instructions

Step 1: Toast belacan – wrap in foil and heat over flame or dry-fry until fragrant and slightly dried, about 2 minutes per side.

Step 2: Using mortar and pestle (traditional) or food processor, pound/blend chilies, shallots, and garlic into coarse paste.

Step 3: Add toasted belacan, continue pounding until incorporated.

Step 4: Add lime juice, sugar, and salt. Mix well and adjust to taste – should be spicy, sour, salty, and savory.

Serving: Use as condiment with rice, noodles, or grilled foods. Keeps refrigerated 2 weeks.

Recipe: Thai Green Curry Paste (with Kapi)

Authentic Thai curry paste requires kapi for depth.

Ingredients

• 1 tablespoon kapi (Thai shrimp paste)
• 10-15 green Thai chilies
• 4 shallots
• 8 garlic cloves
• 2-inch piece galangal
• 2 stalks lemongrass (bottom portion)
• 1 tablespoon cilantro roots (or stems)
• 1 teaspoon coriander seeds, toasted
• 1/2 teaspoon cumin seeds, toasted
• 1 teaspoon white peppercorns
• 1/2 teaspoon salt

Instructions

Step 1: Grind coriander, cumin, and peppercorns in mortar or spice grinder.

Step 2: Pound or blend chilies with salt until broken down.

Step 3: Add galangal, lemongrass, and garlic. Pound until paste forms.

Step 4: Add shallots and cilantro roots, continue pounding.

Step 5: Add kapi and ground spices. Pound until smooth, uniform paste.

Using: Fry paste in coconut cream until fragrant before adding other curry ingredients.

Recipe: Kimchi with Saeujeot

Traditional kimchi uses saeujeot for umami depth.

Key Ingredient Addition

In traditional kimchi paste, add 2-3 tablespoons saeujeot (or saeujeot liquid) per napa cabbage head. The fermented shrimp provides:

• Umami depth
• Additional salt content
• Enzymes that may support fermentation
• Traditional flavor profile

See our kimchi variations guide for complete recipes.

Health Considerations

Nutritional Aspects

• Protein: Good source of protein from shrimp
• Minerals: Contains calcium, iron, and other minerals
• Probiotics: Some unprocessed varieties may contain beneficial bacteria
• Omega-3s: Small amounts from shrimp content

Considerations

• High sodium: Very salty – use as seasoning, not main ingredient
• Shellfish allergies: Must avoid if allergic to shellfish/shrimp
• Tyramine content: Fermented foods contain tyramine – those on MAO inhibitors should avoid
• Pregnancy: Generally safe in cooking amounts but consult healthcare provider

Substitutions and Alternatives

If You Can’t Find Specific Varieties

• Belacan substitute: Thai kapi (similar enough for most recipes)
• Kapi substitute: Belacan (toast and use slightly less)
• Saeujeot substitute: Fish sauce + tiny amount of anchovy paste (not ideal but workable)

For Those Who Can’t Eat Shellfish

• Fish sauce: Provides similar umami, though different flavor profile
• Miso + fish sauce: Combined can approximate shrimp paste depth
• Vegan alternatives: Fermented bean paste + seaweed + miso (for Korean dishes). Not identical but provides umami.

Frequently Asked Questions

Why does shrimp paste smell so strong?

The fermentation process breaks down proteins, creating volatile sulfur and nitrogen compounds with intense aromas. This is similar to (though stronger than) what happens with aged cheese or fish sauce. The smell is normal and doesn’t indicate spoilage.

Do I have to toast belacan before using?

For best results, yes. Toasting dries out excess moisture, mellows the raw fishy smell, and develops deeper flavors. It also makes the hard block easier to crumble. Softer pastes like kapi don’t require toasting.

Can I substitute fish sauce for shrimp paste?

Not directly – they provide different flavors. Fish sauce is liquid and more straightforwardly savory; shrimp paste has complex, funky depth. In a pinch, you can use fish sauce plus a small amount of anchovy paste, but the dish won’t taste the same.

How do I reduce the smell when cooking?

Turn on your kitchen exhaust fan, open windows, and ensure good ventilation. Cook over high heat to quickly transform the raw smell into appetizing aroma. The smell dissipates relatively quickly and transforms completely in the finished dish.

Is shrimp paste the same as shrimp sauce?

No – shrimp paste is fermented and concentrated. “Shrimp sauce” usually refers to a thinner, sometimes sweetened sauce made with shrimp paste. They’re related but not interchangeable.

How long does shrimp paste last?

Almost indefinitely when stored properly. The high salt content and fermentation act as preservatives. Refrigerated and well-sealed, shrimp paste remains good for years. Discard only if you see mold or detect rancid (not funky) smells.

Final Thoughts

Fermented shrimp paste is a gateway to authentic Southeast Asian and Korean cooking. Once you understand how to use it – in small amounts, cooked into dishes, balanced with other flavors – you’ll unlock depth and complexity that no other ingredient provides. The intense smell is simply the price of admission to extraordinary flavor.

Start with sambal belacan or a Thai curry paste. The shrimp paste will work its magic invisibly, and you’ll understand why this ancient ingredient remains essential across Asian cuisines. The funky fermentation, concentrated umami, and unique savory depth simply cannot be replicated by anything else.

Your first homemade sambal belacan will change your understanding of what’s possible in a condiment. And once you taste authentic Thai green curry made with proper kapi, restaurant versions may never satisfy again.

Embrace the funk. Your cooking will never be the same.