Gkrachai (lesser ginger or rhizome) is imported from Thailand in frozen pouches, and can be found in Southeast Asian markets. The color in this dish is achieved from the serranos, with the seeds included. Adjust the recipe according to your tastes. As written, the recipe will produce a very spicy paste. This curry paste will keep for at least a month in your fridge if stored in a nice air tight container.
For those who want to make their own Thai red curry paste. This stuff is fantastic and well worth the effort. Finding the ingredients is the challenge, but once you do making it is fairly easy. Adapted from "Hot, sour, salty, sweet"
This curry powder/paste is the result of an afternoon creating a curry that would keep my non curry headed friends happy but not bore the others. I really recommend a spice grinder as the flavour of freshly ground spices is just so much better than store bought powders. Keep the powder in the fridge to help retain the flavours longer. The powder should be enough for a minimum of 10 curries.
This is an intensely flavored spice blend that goes well in any curry dish. Toss some curry paste with steamed veggies and serve them on rice. Tightly sealed and refrigerated, this will keep for at least a week, and it may also be frozen for extended storage.