If you haven't made the paste beforehand, you can start baking the pumpkins while you make it. See instructions below for starting the Pumpkin Soup. Pour 2 cups of boiling water into a bowl with the dried chilies. Let the chilies soak while you prepare all the other ingredients.
Toast the coriander, peppercorns, and cumin in a skillet over medium-low heat until fragrant, light brown, and they begin to crackle and pop (about 1 to 2 minutes). Transfer to a bowl and allow to cool completely before grinding in a spice grinder, in a mortar and pestle, or in a Vitamix.
Drain the chiles soaking in the bowl but reserve the soaking liquid.
Place the chiles in the bowl of a food processor and pulse until they have been chopped into fairly small pieces.
Add the lemongrass and pulse until they have reached a shredded consistency.
Add the Thai lime leaves and cilantro and pulse. Add the galangal and pulse until it’s finely chopped and incorporated.
Add the red peppers and pulse until finely chopped and incorporated.
Add the garlic and shallots and pulse until they are finely chopped and are fully incorporated.
Add the shrimp paste and pulse until it is incorporated. You might have to add a tablespoon of the reserved chili-soaking liquid to make the mixture move around.
Add the toasted and ground spices and the salt and pulse until fully incorporated.
Store in mason jars in the freezer.