Gravy for Thanksgiving? Flour. You want that rich, brown, meaty texture. Cornstarch would look weirdly fake and clear. Not festive.
Fruit pie? Cornstarch all the way. It holds clear, shiny juices. Flour makes pie filling look like mud. Nobody wants mud pie.
Stir-fries? Cornstarch. It coats the meat for a velvety bite, and the sauce stays glossy. Flour would make it pasty and sad.
Mac and cheese? Flour, because you’re building a creamy cheese sauce. Cornstarch would make it slippery and break under high heat.
Pudding? Cornstarch is the star. It gives that bouncy, smooth-set texture. Flour makes pudding taste like wheaty paste. Yuck.
The Freeze Test
Here’s a weird one: flour sauces survive freezing. Cornstarch sauces get separated and weepy. So for frozen pot pies, use flour. Your future self will thank you.
Cornstarch hates lemons and vinegar too. Acid breaks it down. So for lemon curd or sweet-and-sour sauce, use flour or arrowroot instead. Drama!
