Black Bean and Squash Soup

Ingredients

• 4 1/2 cups cooked black beans
• 1 cup drained canned tomatoes, chopped
• 1 1/4 cups chopped onion
• 1/2 cup minced shallot
• 4 garlic cloves minced
• 1 tablespoon plus 2 teaspoons ground cumin
• 1 teaspoon salt
• 1/2 teaspoon freshly ground black pepper
• 1/2 stick (1/4 cup) unsalted butter
• 4 cups beef or vegetable broth
• 1 1/2 cups cooked and pureed squash, pumpkin or sweet potato
• 1/2 cup dry Sherry
• 1/2 pound cooked ham, cut into 1/8-inch dice
• 3 to 4 tablespoons Sherry vinegar
• sour cream and coarsely chopped lightly toasted pumpkin seeds