Preheat a large heavy bottomed pan, preferably cast iron, over medium heat. Dry toast the seeds in the pan for about 2 minutes, stirring frequently, until they’re fragrant and a few shades darker, just be careful not to burn. Raise the heat to medium high, add the oil and saute the onion, peppers and garlic for about 10 minutes, until onions are browned. Add the tomato sauce, salt and syrup and cook for about 5 minutes.