Recipes that only call for a small amount of buttermilk can be frustrating since it is only sold in quart sized containers.  To save buttermilk, simply measure out 1 cup amounts and pour into ice cube trays and freeze. Once frozen, store in freezer bags until needed. Then, thaw in the refrigerator or microwave and blend to reconstitute.

—Izzi, Vegetarian Epicurean

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