Sour Milk Recipe (Easy Homemade Buttermilk Substitute)
A quick, reliable way to make sour milk (a buttermilk substitute) using fresh milk and a splash of vinegar or lemon juice. Perfect for baking biscuits, pancakes, muffins, and more when you don’t have buttermilk on hand.
Ingredients
- 1 cup fresh milk whole milk preferred; 2% or skim will also work
- 1 tablespoon white vinegar or lemon juice distilled white vinegar for neutral flavor, or freshly squeezed lemon juice
- Optional: 1 teaspoon heavy cream for a slightly richer, thicker “buttermilk” style sour milk
- Optional: 1 tablespoon plain yogurt for extra tang and thickness
Instructions
- Pour 1 cup (240 ml) fresh milk into a liquid measuring cup. Room-temperature milk will curdle a bit faster, but cold milk works as well.1 cup fresh milk
- If you want a richer, thicker sour milk, stir in 1 teaspoon heavy cream and/or 1 tablespoon plain yogurt into the milk before adding the acid.Optional: 1 teaspoon heavy cream, Optional: 1 tablespoon plain yogurt
- Stir in 1 tablespoon (15 ml) white vinegar or lemon juice. Use a small whisk or fork to distribute the acid evenly throughout the milk.1 tablespoon white vinegar or lemon juice
- Stir gently for about 10–15 seconds, then let the mixture sit at room temperature for 5–10 minutes. It will begin to slightly thicken and form small soft curds.
- After resting, the sour milk should be a bit thicker than plain milk, with tiny curdled bits and a faint tangy smell. This is exactly what you want.
- Use the sour milk right away in place of buttermilk or sour milk in your recipe, substituting 1:1 for the amount of buttermilk called for.
- If you only have 3–4 minutes, increase the acid to 1 tablespoon plus 1 teaspoon per cup of milk. Stir very well and let rest 3–5 minutes before using. The result will be a bit tangier but still works well for baking.1 cup fresh milk, 1 tablespoon white vinegar or lemon juice
Notes
Storage: Leftover sour milk can be refrigerated in a sealed container for up to 2 days; stir or shake before using and always smell it first—if it smells unpleasant or cheesy, discard it. You can freeze it in ice cube trays for baking-only use; the texture may be grainy after thawing. Use this sour milk 1:1 in place of buttermilk in most baking recipes, especially those containing baking soda. For non-dairy versions, unsweetened soy milk or oat milk curdle reasonably well with vinegar and can work in vegan recipes, though results vary. Do not use naturally spoiled milk in place of this controlled sour milk.
Nutrition
Calories: 150kcal
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