A seasoned liquid in which foods such as meat, fish and vegetables are soaked (marinated) in order to absorb flavor and, in some instances, to be tenderized. Most marinades contain an acid (lemon juice, vinegar or wine) and herbs or spices. The acid ingredient is especially important for tough cuts of meat because it serves as a tenderizer. Because most marinades contain acid ingredients, the marinating should be done in a glass, ceramic or stainless steel container-never in aluminum.