Flour Is More Than a Baking Ingredient

Flour is cheap stored potential. Mixed with water, its proteins can form an elastic gluten network. Heated with liquid, its starch absorbs water and thickens. Dusted onto moist food, it creates a dry surface that browns and crisps. Those three behaviors explain most of its everyday jobs.

Thicken with starch

For gravy, bechamel, or a pan sauce, cook flour in roughly the same amount of fat to make a roux. A tablespoon each of fat and flour can begin thickening about a cup of liquid, though the final result depends on the flour, cooking time, and desired texture. Whisk in liquid gradually and simmer long enough to remove the raw flour taste.

You can also coat stew meat lightly in flour before browning, then add liquid. The flour left in the pot thickens the sauce as it simmers. Do not add a large spoonful of dry flour directly to hot broth; the outside gels before the inside disperses, creating lumps.

Create a dry surface

A thin flour coating helps chicken, fish, sliced vegetables, and cutlets brown. Pat the food dry, season it, dredge lightly, and shake off excess. Flour is not glue: a heavy coat becomes dusty or gummy. For a thicker crust, build deliberate layers with flour, egg, and crumbs.

Flour also keeps soft dough from sticking, but every extra handful changes that dough. Dust the work surface sparingly and use a scraper before adding enough flour to make bread tough.

Build structure

Add water and agitation to wheat flour and gluten begins to form. Bread needs enough development to trap gas from yeast. Cake and muffin batters need less, because too much gluten makes them chewy or tunneled. That is why bread is kneaded while muffins are mixed just until combined.

All-purpose flour is the useful default. Bread flour has more protein and usually makes chewier dough. Cake flour has less and makes tender cakes. Whole-wheat flour includes more of the grain, absorbs more water, and brings stronger flavor. These flours can sometimes substitute for one another, but the texture and water requirement will change.

Substitute by job

Cornstarch can thicken a glossy sauce but does not build bread structure. Oats can add body but will not create the same elastic dough. Gluten-free blends are formulated for different jobs; one blend may work for cake and fail for yeast bread. Ask what the flour is doing before replacing it.

Store flour sealed, cool, and dry. Whole-grain flour spoils faster because it contains more oils; freeze it if you use it slowly. Continue with How to Thicken a Sauce, Soup, or Stew or compare baking soda and baking powder.