To soak food in a marinade. When marinating foods, do not use a metal container, as it can react with acidic ingredients to give foods an off flavor. Always marinate foods in the refrigerator, never on the kitchen counter. To reduce cleanup, use a plastic bag set in a bowl or dish to hold the food you are marinating. Discard leftover marinade that has come in contact with raw meat. Or if it's to be used on cooked meat, bring leftover marinade to a rolling boil before using to destroy any bacteria that may be present.