Naem, or naem moo, is Thailand’s sour pork: minced lean pork, boiled pork rind cut into threads, garlic, salt and a little cooked sticky rice, packed with whole bird’s-eye chillies into banana-leaf parcels or tight plastic tubes and left for a few days until it turns pink, firm and sour. It is everywhere in Thailand — wrapped in leaf at markets, in neat pink plastic logs in convenience stores — and it is usually eaten raw, with raw ginger, peanuts, chillies and shallot. The diagnostic detail is the rind: a third or so of the mix is chewy pork skin, which makes it more springy than any European fermented sausage. Like nem chua, it relies on stacked hurdles, not acid alone. Thai food-safety work keeps finding Salmonella and Staphylococcus aureus in naem, even after the pH falls to about 4.5, and recommends cooking it. This home version uses a commercial culture, Cure #1 and a pH meter, and it is cooked: grilled in its leaf, or crumbled into naem khao, the crisp rice salad. I have not made this one yet; the formula is built from the traditional Thai ingredient list and Thai research on naem fermentation and is untested.
Ingredients
MEAT BLOCK (2,270 g / 5 lb), % of meat weight
- 1,700 g (3 lb 12 oz) lean pork leg or loin, trimmed of fat — 75%
- 570 g (1¼ lb) pork rind, boiled, fat scraped off, sliced into thin threads — 25%
RICE (% of meat weight)
- 136 g (4¾ oz) cooked glutinous (sticky) rice, mashed — 6%
CURE AND SEASONING (% of meat weight)
- 50 g fine salt (2.2%)
- 5.7 g Cure #1 (0.25%) — 2.5 g/kg = 156 ppm nitrite
- 11 g dextrose (0.5%)
- 114 g garlic, minced (5%)
- 25–30 whole fresh bird’s-eye chillies (about 1%)
- 0.6 g Bactoferm LHP or another fast lactic starter, at the maker’s dose (a 25 g pack treats 100 kg), in 30 ml distilled water
WRAPPING
- Banana leaves in 15 cm (6 in) squares, softened over a flame, and plastic wrap
TO SERVE
- Fresh ginger in slivers, roasted peanuts, shallots, raw cabbage
Directions
- In the collection: cook the rice as for Thai Sticky Rice (Soaked and Steamed); it is the food for the lactic bacteria. Salt and Cure #1 are the safety.
- Prepare the rind: boil the rind 20–30 minutes until tender, chill in ice water, scrape off all fat and slice into threads 3 cm long. Leftover fat goes rancid and makes the parcels greasy.
- Grind and mix cold: grind the chilled lean through a 3 mm plate. Mix in salt and Cure #1 until sticky, then dextrose, garlic, mashed rice and the culture water, then fold in the rind threads. Keep 50 g in a bag for the pH meter.
- Pack: press 100 g portions into tight logs, set two or three whole chillies on each, and wrap firmly in banana leaf then plastic, squeezing out all air. Air pockets are where the wrong organisms grow.
- Ferment — the safety step: hold at 28–30 °C / 82–86 °F for 24–48 hours, checking the pH from 18 hours on. Aim for pH 4.8 or lower; the program floor is 5.3 and it must be reached within 46 hours at 86 °F (degree-hour rule). If it has not, discard. Done naem is firm, uniformly pink and cleanly sour.
- Chill: refrigerate as soon as the pH is reached; use within 1 week, or freeze.
- Cook it: grill the parcels in their leaves over medium charcoal for 8–10 minutes, turning, to 71 °C / 160 °F. Unwrap and eat hot with ginger, peanuts, shallot and cabbage.
- Or make naem khao: crumble cooked naem into crisp fried curried rice balls with lime, fish sauce, chilli, peanuts and herbs (see Variations).
- Sibling recipe: Nem Chua (Vietnamese Sour Pork, Grilled or Fried) is the Vietnamese twin; Sai Krok Isan (Thai Fermented Pork and Rice Sausage) is the same idea in a casing.
Notes
Where this recipe came from — and what it isn’t. The ingredient set is the standard Thai one — lean pork, boiled rind, garlic, salt, cooked rice, whole chillies, with saltpetre or nitrite — described in Thai research on naem, including the National Research Council’s 1992 volume Applications of Biotechnology to Fermented Foods (chapter on mixed starter cultures for Thai nham) and later safety studies. Proportions here are a working balance, not a published standard. Deviations: (1) Cure #1 at 156 ppm instead of the saltpetre (dinpasiw) older Thai recipes use; (2) a commercial starter and dextrose; (3) a controlled ferment checked by pH meter; (4) it is cooked. Untested.
The traditional way, stated truthfully. Naem is fermented at room temperature, usually about three days in Thailand’s heat, and most of it is eaten raw. Studies report the pH falling to about 4.5. A quantitative risk assessment of Salmonella in naem (Agriculture and Natural Resources journal) found the count falls during fermentation but the organism still turns up in a meaningful share of samples and can regrow during refrigerated storage; a separate study found Staphylococcus aureus contamination tied to handling. Work with a pediocin-producing Pediococcus pentosaceus starter, nitrite and garlic showed they suppress Salmonella during fermentation — which is the argument for a starter culture. Raw pork in the region also carries Trichinella, which a short ferment does not reliably remove. Cooking removes all of these problems at once.
Where naem came from. Naem belongs to the Thai and Lao family of sour pork ferments that use cooked rice as the sugar source — sai krok Isan, som moo — and is made across the country, with northern and north-eastern versions the best known. No dated origin is documented. Thai food-science departments have studied it closely, and much commercial naem is now sold in plastic tubes.
The name. Naem (แหนม) is the general word; naem moo specifies pork. Spellings in English include nham and nahm. Som moo is a close relative.
Variations. Naem khao (also naem khluk) is a salad of crisp fried rice balls seasoned with red curry paste, broken up and tossed with crumbled naem, lime, fish sauce, chilli, peanuts, ginger, shallot and herbs — a dish, not a sausage, and a good use for cooked naem. Naem yang is grilled naem. Naem si khrong mu is the same ferment on pork ribs. Some makers add a little sugar or MSG; some use only rind.
Sourcing and gear. Pork rind is sold by many butchers; Asian groceries sell sliced cooked rind. Banana leaves are sold frozen. Bactoferm LHP is the fast warm culture; a meat pH meter and a box that holds 28–30 °C are the essential tools.
Still open. The NRC chapter’s exact formula was not re-read for this page. No validated home schedule exists for eating naem raw.
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