How to Make It
Heat oil in a large skillet over medium-high. Add onion, and cook, stirring often, until onions soften and begin to brown, about 7 minutes. Add tomatoes, cocoa, salt, and chile powder, and cook, stirring to break tomatoes apart, until mixture comes to a simmer, about 4 minutes. Transfer mixture to a blender. Remove center piece of blender lid; secure lid on blender, and place a clean towel over opening in lid. Process until smooth. Serve over roasted pork or grilled chicken.