salad dressings. It can also be used in many other recipes such as burgers or meatloaf. Onion salt is used as a seasoning atop finished dishes and as an ingredient in many types of dishes, such as meat and vegetable dishes, casseroles and soups. See also Celery powder Celery salt Chili powder Garlic powder Garlic salt List of culinary herbs and spices List of onion dishes syn-Propanethial-S-oxide, the molecule that gives onions and onion powder their strong flavor. References Further reading 5 pages. Onion-based foods Spices Edible salt Condiments Powders