Black Bean Quesadillas

INGREDIENTS:

3 cn (15 1/2 oz) black beans
-(about 4 1/2 cups); rinsed
-and drained
1 c Drained canned tomatoes;
-chopped
1 1/4 c Chopped onion
1/2 c Minced shallot
4 Garlic cloves minced
1 tb Plus 2 teaspoons ground
-cumin
1 ts Salt
1/2 ts Freshly ground black pepper
1/2 Stick; (1/4 cup) unsalted
-butter
4 c Beef broth
1 cn (16-oz) pumpkin pure? (about
-1 1/2 cups)
1/2 c Dry Sherry
1/2 lb Cooked ham; cut into
-1/8-inch dice
3 tb Sherry vinegar; (up to 4)