With a slotted spoon, transfer the chiles, onion and garlic to a food processor, reserving the liquid. Add the brown sugar, cumin, oregano, tomato paste and 1 cup of the reserved chile liquid. Puree, adding more of the chile liquid until the ketchup reaches the desired thickness. Add salt and pepper to taste. Tightly sealed in a glass jar, the ketchup will keep refrigerated for several months.
This recipe yields about 4 cups.
Yield: 4 cups