Soak the chilies in water for at least an hour to soften.
Using a heavy-duty mortar and pestle or a spice/coffee grinder, grind the toasted coriander seeds, toasted cumin seeds, and white peppercorns into a fine powder. Remove and set aside.
Grind roasted peanuts in the mortar and pestle until fine; remove and set aside.
Drain the chilies from soaking water and dry off excess water with paper towel. Cut into small pieces. Add chilies and salt to a heavy-duty mortar and pestle; pound into a rough paste. Add the ground dry spices to help absorb the liquid from the chilies and continue pounding to a fine paste.
Add lemongrass, galangal, kaffir lime rind & leaf. Pound into a fine paste.
Add shallots and garlic. Pound into a fine paste.
Add ground peanuts and shrimp paste, pound to mix.