Invent Your Own Casserole

: To sour reconstituted milk, add a little vinegar [or lemon juice] to it, and stir it up. For instance, if a recipe calls for 1-cup of sour milk or buttermilk, then measure a tablespoon of vinegar into a measuring cup. Add reconstituted milk to reach the 1-cup mark. Stir the milk gently. In a moment or two, it will sour. ................
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