Buttermilk , or buttermilk , or buttermilk, is a traditional ingredient widely used in cooking to bring a touch of acidity and lightness to preparations. It is available in stores in many countries, particularly in the United States, but it is not easily found in France. Homemade buttermilk is a quick and easy alternative to make with just two ingredients. It is ideal for preparing pancakes, soft cakes, marinades or creamy sauces, while respecting a gluten-free diet.
Buttermilk

Ingredients
Preparation
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Mix the milk and lemon or white vinegar: In a container, pour the milk of your choice. Then add the tablespoon of fresh lemon juice or white vinegar.
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Let it sit: Mix the milk well and let the mixture sit at room temperature for about 10 minutes. The milk will begin to thicken and curdle slightly, giving it a texture similar to buttermilk.
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Use the buttermilk: After 10 minutes, the buttermilk is ready to use in your recipes. Use it immediately or store it in the refrigerator for up to a day to enjoy all its freshness.
Note
Vegan version : You can make vegetable buttermilk using soy or almond milk with the same proportion of lemon juice or vinegar.