Put onions, garlic, orange juice (or lime juice) and water in a blender. Set blender on "liquify" setting and process. Crush all dry ingredients together and add them to blender. Process for one minute more.
Marinate meat (chicken, beef, pork or fish) for at least one hour in mixture. It is better to marinate meats overnight. Brush meat frequently with the sauce while cooking. Makes 2 cups.