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How to freeze buttermilk
Portion out the buttermilk into usable amounts.
This amount may change depending on what you use the buttermilk for. You might find 1/4 cup (2 oz) portions ideal, or you may prefer 1 liter (. 26 gallon) portions.
Write down what recipes you plan on using the buttermilk for and pick the most common amount. You might freeze bags of varying sizes so your portions fit many recipes.