Substitutes for buttermilk:
-Measure 2 tablespoons / 30 ml of vinegar or lemon juice in a measuring cup. Add milk to fill to the 2 cup / 500 ml mark. Let the milk sit for 10 minutes before using.
-Stir together 1-1/2 cups / 375 ml plain yogurt and 1/2 cup / 125 ml milk.