Prepare the chilies: Soak the dried red chilies in warm water for about 15 minutes, until softened. Drain and set aside.
1/2 cup Dried red chilies
Toast the spices: In a small dry pan, toast coriander seeds, cumin seeds, and white peppercorns over low-medium heat until fragrant, about 2-3 minutes. Let cool, then grind into a fine powder using a spice grinder or mortar and pestle.
1/4 tsp Coriander seeds, 1/4 tsp Cumin seeds, 1/2 tsp White peppercorns
Blend everything: Grind the lemongrass and garlic first. Then, add the soaked chilies and all the other aromatics and spices blend in a food processor until a smooth, cohesive paste forms. This may take 10-15 minutes of pounding by hand or several minutes in a food processor.
1/4 cup Lemongrass, 5-6 cloves Garlic, 2 tbsp Galangal, 1 Shallot, 1/2 tbsp Kaffir leaves, 1/4 tsp Salt, 1/2 tbsp Oil
Store: Transfer the paste to an airtight, glass container. It will keep in the fridge for up to 2 weeks or in the freezer for up to 3 months.