Step 1

Put the pinto beans in a bowl and cover with 2 inches of water. Soak for 8 hours to overnight.

Step 2

Transfer the beans to a medium saucepan and cover with water by about 1 inch. Add onion, garlic, chili powder, cumin, celery seed, salt, and black pepper. Bring to a boil, then reduce heat to low, cover, and let cook for 1 1/2 hours.

Step 3

Use a colander to separate the liquid from the solids. Transfer the solids to a food processor with diced tomatoes, hot sauce, oregano, and cayenne. Blend to desired consistency.