Marian's Pumpkin Soup

INGREDIENTS

• 1 tablespoon butter
• 1 onion, chopped
• 2 cloves garlic, minced
• 1/2 teaspoon curry powder
• 1/4 teaspoon red pepper flakes
• 2 1/2 pounds sugar pumpkin -- peeled, seeded and cubed
• 10 cups chicken broth
• 1 teaspoon Worcestershire sauce
• 1/4 teaspoon ground nutmeg
• 1 tablespoon creamy peanut butter
• 1/2 cup light cream
• 1/4 cup chopped fresh cilantro, for garnish