Source: Midwest Living
To make 1/2 cup sour milk, place 1-1/2 teaspoons lemon juice or vinegar in a glass measuring cup. Add enough milk to make 1/2 cup liquid; stir. Let the mixture stand for 5 minutes before using it in a recipe.
205 calories; fat 7g; cholesterol 32mg; carbohydrates 34g; sodium 219mg.