Savory Refried Beans

2 tablespoons vegetable oil
1 pound 2 ounces onions, chopped
2 tablespoons garlic, minced
3 pounds 4 ounces canned tomatoes, crushed
3 tablespoons chili powder
2 tablespoons ground cumin
11 pounds pinto beans, cooked or canned,
    drained (7 pounds 8 ounces drained weight)

Heat oil in a medium size heavy pot. Add onions and cook, stirring often, until soft (10 minutes). Add garlic and cook 2 minutes more. Stir in tomatoes, chili powder and cumin. Bring to a boil, lower heat and simmer for 5 minutes.

If using canned pintos, rinse to partially remove salt.

In a food processor, pur