Naem (nham, แหนม) is a Thai fermented pork sausage: minced pork and shredded pork rind mixed with cooked sticky rice, garlic, salt and chili, packed tightly in banana leaves or plastic, and left to ferment for a few days until firm, pink and pleasantly sour. It’s popular across Thailand, especially the Northeast (Isaan), and closely related to Lao som moo and Vietnamese nem chua. It’s eaten as a snack with raw cabbage, ginger, shallots, chilies and peanuts, grilled or fried, or crumbled into fried rice and crispy rice salad (naem khao tod).
Why Naem Is Sour
Naem is made without heat: lactic acid bacteria ferment the rice and sugar and produce lactic and acetic acid, and in good batches the pH drops to the nham quality standard of 4.6 or below within 3–5 days. Lactobacillus, Lactococcus, Pediococcus and Weissella make up more than 90% of the bacteria (Santiyanont et al., 2019). Commercial producers also add a measured amount of nitrite, which is a critical control against Clostridium botulinum (Paukatong & Kunawasen, 2001).
Is Naem Safe? Cook It
Naem is traditionally eaten raw in Thailand, but raw fermented pork carries real risks:
- Bacteria: nham has been contaminated with Salmonella, Staphylococcus aureus and Listeria monocytogenes; because it isn’t cooked during production, food-safety researchers recommend labeling it “safe if cooked before consumption” (Paukatong & Kunawasen, 2001). In 155 market samples, 39% contained S. aureus (though no enterotoxins), and the risk was lower when the pH was 4.6 or below (Chokesajjawatee et al., 2009).
- Parasites: Trichinella is transmitted in Southeast Asia by eating raw or undercooked pork (Yera et al., 2022); fermentation isn’t a reliable way to kill it.
- Streptococcus suis: eating raw pork, blood and offal is an important contributor to human S. suis disease in Southeast Asia (Kerdsin et al., 2022).
- Biogenic amines: over-fermented naem can build up unsafe levels of tyramine and other amines (Santiyanont et al., 2019); eat it before its date and keep it refrigerated.
Our advice: buy commercially made naem and cook it until steaming hot all the way through – grilled, fried or in fried rice. We don’t recommend making naem at home: without a tested process, measured curing salt and pH checks, raw pork fermented at room temperature is a serious risk. For a safe fermented dish in the same spirit, try sour, garlicky sauerkraut or kimchi.
How Naem Is Eaten
- Grilled or fried: slices or whole parcels, served with cabbage, fresh ginger, shallots, bird’s eye chilies and roasted peanuts.
- Fried rice (khao phat naem): the recipe card below.
- Crispy rice salad (naem khao tod): fried rice balls crumbled with naem, lime, herbs and peanuts – cook the naem first.
Related Southeast Asian ferments: Cambodian prahok and Lao pa daek.