Heat chiles in a 12″ skillet over high heat and cook, turning, until lightly toasted, about 5 minutes; transfer to a blender. Return skillet to heat and add almonds and peanuts; cook, stirring often, until lightly toasted, about 3 minutes. Transfer nuts to blender, reserving skillet, and add raisins, cumin, cinnamon, garlic, cloves, chocolate, onion, and 5 cups boiling water; season with salt and pepper, and puree until smooth. Set sauce aside.