【How-to】How do you make mushroom gravy from scratch

Country Gravy: Water, vegetable shortening (partially hydrogenated soybean oil and/or cottonseed oil), corn starch, bleached and enriched wheat flour (niacin, reduced iron, thiamine mononitrate, riboflavin), corn syrup solids, salt, sugar, sodium caseinate (a milk derivative), black pepper, mono and diglycerides, …