Microwave onion pieces (reserve finely chopped onion), anchos, oil, sesame seeds, cocoa, garlic, cinnamon, and salt in bowl, stirring occasionally, until onion is softened, about 5 minutes. Transfer to Ace blender along with broth, tomatoes, raisins, and peanuts. Lock lid in place, then select Soup Program 2 (for creamy soups).