If you’re forced to swap, adjust your expectations. Use half the amount of cornmeal you’d use of cornstarch. No, wait—actually, use the same amount, but be prepared for a different result.
Real cornstarch thickens at a 1:2 ratio (one tablespoon per cup of liquid). Cornmeal takes more and longer. It needs to simmer for 20 minutes to soften and swell.
Even then, it won’t be clear. It’ll be opaque and grainy. So don’t use it for a shiny glaze. Use it for a chowder or a bean dish where you want heft.
What About Desserts? Run.
Cornstarch is the secret to silky puddings, custards, and pie fillings. Cornmeal will give you… grits pudding. Is that a thing? Yes, it’s called “polenta pudding,” and it’s fine on its own.
But if you’re trying to make a vanilla pudding? No, just no. You’ll taste the corn. Your guests will raise an eyebrow. “Did you put… sand in my dessert?”
Just don’t. Keep cornmeal for savory, cornbread, or cracking jokes. Cornstarch is for smooth operators.
