[1][2][3] Many various ingredients may be used in preparations of onion sauce, such as cream, milk, butter, chicken broth, wine, port wine, beer, lemon juice, flour, salt, pepper, cayenne pepper, nutmeg, dry mustard, sage and other herbs, mushroom ketchup, bread crumbs, bacon and others.

[1] Preparation generally involves slicing or dicing and then cooking the onions, adding additional ingredients, and then continuing to cook or simmer the mixture to create a sauce.

[1][2] Onion sauce can be used to complement many foods, such as potatoes and peas, meats, such as pork, duck, rabbit, mutton, and liver, such as calf liver.

[1][2][4] Onion sauce prepared with bread crumbs may be used as a stuffing, which can be used in various poultry dishes, such as goose.

It is a standard condiment at many Sabrett-branded hot dog carts.