Allergen Information Contains: Barley, Celery, Eggs, Milk, Mustard, Oat, Rye, Soy, Wheat. Allergen information Contains: Barley, Celery, Eggs, Milk, Mustard, Oat, Rye, Soy, Wheat. A versatile dry sauce mix that can be used as a base for many other sauces and many popular dishes.