Nam prik num

A Lanna dip sold as much as made

Nam prik num is a dip from northern Thailand, usually described as Lanna food. A Chiang Rai food retailer presents it as a green-chilli, shallot and garlic dip seasoned with salt and finished with coriander and spring onion. The same retailer associates it with pork crackling and vegetables, and sells it to visitors as a souvenir. The dip is therefore visible in markets and shops as much as in home kitchens, and how often households make it is not recorded.

A 2010 photograph on Wikimedia Commons, uploaded by a user named Takeaway, describes the dip as sold at almost every market in northern Thailand and eaten with sticky rice, lightly steamed vegetables, tree leaves and flowers. That is a caption by an uploader, not a survey, and it is used here only for the serving pattern.

What the name points to

The retailer explains phrik num as fresh peppers that are not yet fully mature. The word refers to an unripe, green stage of the chilli, not to one named variety. The retailer cites two regional works of 1995 and 1999 for this reading.

An encyclopaedia entry lists the dip as of Lao origin while placing it among Northern Thai dishes. Its references are a 1995 cookbook by Sven Krauss and a Thai government recipe page. Neither settles where the dip began, and no source read here names a cultivar. A cook who wants a particular pepper should choose by colour, heat and texture rather than follow a variety named in a secondary account.

Roast, peel and pound

The retailer's method roasts the chillies, shallots and garlic first, then peels the shallots and garlic and pounds the roasted material with salt until fine. Coriander and spring onion go on at the end. The Commons caption gives the same sequence, with grilled young green chillies, grilled shallots and grilled garlic pounded in a mortar and pestle. The caption adds lime juice, fish sauce and coriander to taste.

Charring does two things. It softens the flesh and skins, which is why the shallots and garlic are peeled after grilling, and it adds a smoky edge that a raw green chilli dip lacks. The retailer recommends charcoal for aroma. That is a stated preference; no source measures the effect. Pounding leaves the dip coarse, with charred pieces of shallot and chilli still visible, and no blender step appears.

Seasoning and variants

Two seasoning families appear. The retailer's version uses salt alone. Its background adds that some versions include chopped fermented fish, or shrimp paste wrapped in banana leaf and grilled. Others use fish sauce and salt, depending on taste. The Commons caption instead lists lime juice and fish sauce as to-taste seasonings with no salt quantity.

The fermented fish and shrimp paste are ingredients in their own right. Their presence does not show that the finished dip ferments, and the retailer's page describes no souring or holding step for the completed dip. Treat the variants as flavour choices, not as evidence about keeping.

Serving and pairing

Serve nam prik num in a small bowl beside the rest of the meal. The retailer's shop page lists sticky rice with yardlong beans, long and pea aubergines and acacia leaves (krathin) as the usual vegetable accompaniments, and mentions pork crackling. The Commons caption adds tree leaves and flowers. Vegetables are a practical partner: the dip is pungent and coarse, and the raw or lightly steamed pieces carry it in the way the dish is usually eaten.

Keeping and handling

No source gives a holding time, a pH, a water activity or a storage temperature for nam prik num. The recipe uses no acid or fermentation to protect it, so its keeping is not established by the method. Make it in small amounts, keep it cold once made, and eat it soon. The UK Food Standards Agency's general chilling guidance, linked in the source list, is a handling convention and not a shelf-life test for this dip.

Charring for flavour is not a preservation step. Neither does sight or smell show that a made batch is safe. If a cook wants to keep the dip longer, that is a separate question that these sources do not answer.

What remains open

The next research step is the 1995 and 1999 regional works cited for the name, read directly, together with Thai-language household sources that record how the dip is made at home. The current sources establish a roasted, pounded, salt- or fish-sauce-seasoned dip, not a cultivar, an origin date or a keeping method.

Judging doneness and seasoning

Doneness here is visual and tactile: the chillies, shallots and garlic should be charred on the outside and soft within, so the peel lifts away and the flesh pounds smooth. No temperature, time or colour standard is given, so the cook judges by sight and touch.

Seasoning is a matter of taste in every version that has been read. The salt quantity in the retailer version is small, half a teaspoon for the whole batch. Taste the dip after pounding and add salt, lime or fish sauce in small steps, because the seasoning is to taste in every version read.