Re: Will WHOLE dehydrated Thai peppers make good pepper flakes?

Unfortunately, Thai peppers are NOT a good substitute. They are mostly just spicy, rather than the more earthy, fruity and moderately spicy Korean peppers. Cayenne also makes a poor substitute as it is too spicy. If you absolutely cannot find gochugaru, you can probably get by with using guajillo, ancho, or Hungarian paprika as these have the most similar profile to gochugaru that I can think of. I’ve never actually used these in kimchi though, so cant be certain.