Yes, if you have leftover buttermilk, pour it into an ice cube tray. Once frozen, transfer the cubes to a freezer safe bag. Can be frozen for up to 3 months. Remove the cubes as needed and let thaw before using or pop straight into soups and stews. Pro tip: I measure 1 tablespoon of buttermilk for each cube so I know exactly how many I need to thaw for each recipe.