Next, toast the dried chilies in the dutch oven/cast iron pot to release more of the flavor. Add the tomatoes, white onion, garlic, oregano, cinnamon, bay leaves, peppercorns, cloves, coriander, and cold water. Cover the pot and bring to boil, then reduce the heat and simmer for 30 minutes. This will soften the chilies and release all their delicious flavor.