I’ve just about recovered fully from a pequin chile. This little thing, barely the size of my pinky nail, packed a mighty wallop. It had a very nice bright, herbal and somewhat citrus-like flavor for about 3 seconds before the heat kicked in. And, probably owing to the minuscule size of the chile, it was an intensely focused heat. Not like a serrano or something where the sheer amount of fruit means that the capsaicin gets everywhere. I can still feel the pain localized on about a quarter of my tongue, one side of my throat, and barely into one ear canal. Good stuff!
