Good question, friend. Flour works, but it’s the clunky cousin of corn starch. Flour makes sauces cloudy and tastes a bit raw if you don’t cook it long enough. Corn starch? It gives you crystal-clear shine and a velvety texture. No raw taste. No weird lumps—if you do it right.
Plus, corn starch has double the thickening power of flour. A little goes a long way. Too much, and you’ll make gravy that doubles as wallpaper paste. Trust me on this.
The Golden Rules (Or You’ll Regret It)
Rule one: Never dump corn starch directly into hot liquid. You’ll get ugly, sad clumps. Always make a slurry first. That means mixing it with cold water until smooth. Think of it as the starch’s warm-up stretch.
Rule two: Don’t boil it forever. Corn starch thickens fast, but too much heat breaks it down. Your sauce will thin out and weep. Keep it gentle—a simmer is your friend.
Rule three: Add it at the end of cooking. Especially if you’re making stir-fry or pie filling. Acidic ingredients (hello, lemon juice!) can also sabotage the thickening. So add acid after the starch sets. Science has no mercy.
For Thickening Sauce, When Do You Use Cornstarch Or Flour?
