Most dry gravy mixes are made from thickeners, flavorings, vegetable or meat or yeast extracts and frequently highly salted. The mix is combined with water then brought to a boil until thickened. Sometimes these mixes are used as a flavoring and thickener for roasts or casseroles. If your recipe calls any flavor of gravy mix you can typically substitute any other similar mix.
Gravy mix is readily available at almost any grocery store.
If you don't have brown gravy mix you can use one of these alternatives:
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