How To Make Buttermilk From Milk?

Add 1 tablespoon lemon juice or white vinegar to a measuring cup

Add enough milk to make 1 cup total

Stir gently

Let stand 5–10 minutes until slightly thickened or curdled

Use immediately as buttermilk in your recipe

For 2 cups, double the vinegar/lemon amount (2 tablespoons) and milk to 2 cups