Thai chili powder substitutes

Ground cayenne lands in almost the same heat range as ground Thai chilies. Tip it into a dry skillet over medium-low heat and stir for 20 to 40 seconds until it smells nutty, then tip it straight back out.

Best for

larb, nam tok, som tam, noodle-shop table condiment, dipping sauces

Untoasted cayenne is the right heat but tastes raw and slightly dusty, and it is missing the roasted, almost smoky aroma that is half of what prik pon contributes. Thirty seconds in a dry pan recovers most of it. Cayenne is also milled much finer, so it dissolves into a dressing instead of sitting on the meat as visible red flecks, and the finished larb looks less speckled.

The coarse red flakes sold for pizza. The particle size is genuinely close to prik pon, which matters more than people expect in a dish like som tam where you can see and bite the flakes.

Best for

som tam, grilled meat dips, noodle soups, table condiment

Standard pizza flakes are roughly a third to a half as hot as ground Thai chilies, so you need one and a half to two times as much for the same burn, and you will taste more sweet dried-pepper flavour and less clean fire. Toast them briefly to add the roasted note. The pieces are also drier and chewier than freshly ground chili, so they soften more slowly in a dressing.

Coarse Korean chili flakes. Visually the best match on the list, a bright brick red with the same loose, flaky texture.

Best for

colour and mild warmth, dipping sauces, dressings, cooking for people who dislike heat

Gochugaru is fruity and slightly sweet with only mild heat, so a larb made with it tastes rounder and noticeably tamer, and the sharp clean sting that defines the dish never arrives. Use two to three times as much and add a small pinch of cayenne if you want to close the heat gap. Gochugaru is sun-dried rather than roasted, so it also lacks the toasted aroma; toast it lightly.

The actual answer if you have a bag of dried bird's eye chilies in the cupboard, which many people do. Dry-roast them whole in a skillet over medium-low for 3 to 5 minutes until they darken and smell toasty, cool, then grind in a mortar or spice grinder.

Best for

larb, nam tok, som tam, any authentic Thai use

This is not a substitute, it is how prik pon is made, and it takes about six minutes. Two practical warnings: the fumes are genuinely fierce, so open a window and do not lean over the pan, and if you grind it fine you get more heat while a coarse grind keeps the flecked look. Store it in a jar away from light and use within a couple of months, since the roasted aroma fades first.

Mexican arbol chilies are in a similar heat class and grind to a comparable coarse red powder, and they are easy to find in the Latin aisle.

Best for

som tam, dipping sauces, grilled meats, table condiment

Heat is close, but arbol has a slightly nutty, faintly grassy character where Thai chili is sharper and more purely hot, so the dressing tastes a shade earthier. Toasting the whole pods before grinding, as you would for a Mexican salsa, puts it very close to prik pon.

A wet substitute for a dry ingredient, which is why it goes last. Reach for it only if you have no dry chili of any kind.

Best for

dressings, dipping sauces, soups

The heat arrives but so does vinegar, garlic, sugar and water, so a larb dressing made this way tastes sweeter, tangier and looser, and you lose the dry toasted aroma completely. Cut the sugar and lime in the recipe slightly to compensate. Never use it where the powder is meant to be sprinkled on top, because it will just make the surface wet.