After the soaking comes the cooking. It's crucial to cook the beans to your desired softness before adding the other ingredients since the acid in the tomatoes will stop the beans from softening any further, no matter how long you cook 'em.
* 2 cups dried pinto or kidney beans, soaked overnight and drained
* 6 cups water
* 1 onion, thinly sliced
* 4 garlic cloves, minced or pressed
* 1 1/2 cups (1 15 oz can or jar) strained or pureed tomatoes or unseasoned tomato sauce
* 1/3 cup firmly packed brown sugar
* 2 Tbsps minced chipotle pepper canned in adobo sauce
2 Tbsps soy sauce
2. Preheat the oven to 300 F. Using a slotted spoon, transfer the beans to a large oven-safe pot with lid or covered casserole dish. Add the onion, garlic, tomato puree, brown sugar, chipotles and soy sauce and stir to combine evenly.
3. Cover and bake for 2 to 3 hours, until the sauce is a nice thick consistency. If necessary, you can remove the lid during the last 30 minutes to allow more of the liquid to cook off. Serve hot.
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