Pour the buttermilk into 1- or 2-cup freezer-safe containers and place in the freezer. Once firm, remove the cubes from the trays and store in an airtight container in the freezer.
To use: thaw completely in a dish in the refrigerator before using in your recipes.
For best results: The fat and water will separate in milk when frozen. Be sure to whisk it well once thawed to recombine.Uses: buttermilk is delicious in salad dressings and marinades as well as in baking.