Buttermilk

Buy cultured buttermilk in the dairy aisle — it keeps far longer than its date suggests, thanks to its acidity. If you are out, a quick substitute is 1 cup of milk plus 1 tablespoon of lemon juice or vinegar, left to thicken for 5 minutes.

For baking, the real thing is worth seeking out — its consistent acidity and cultured flavor produce better results than the homemade substitute.

Traditional buttermilk (the liquid from churning cultured butter) is harder to find but richer and more complex; seek it out at farmstead dairies if you can.

Refrigerate buttermilk and use within 1–2 weeks of opening. It can often be used well past its printed date — the high acidity keeps it safe.

Buttermilk freezes well for baking; portion it into ice cube trays or small containers and thaw in the refrigerator. Stir before using, as it separates on thawing.

A little leftover buttermilk can culture a fresh batch — add a few tablespoons to warm milk and let it sit at room temperature for 12–24 hours.

Buttermilk's acidity is its superpower in the kitchen.

Pancakes & Biscuits: Buttermilk's acidity reacts with baking soda for tall, tender leavening — the secret to fluffy pancakes and flaky biscuits.

Cakes & Muffins: Adds moisture, a tender crumb, and a subtle tang that balances sweetness in red velvet, chocolate, and coffee cakes.

Marinades: Tenderizes chicken and pork while adding tang — the classic Southern fried chicken brine.

Dressings: The base for ranch, buttermilk, and green goddess dressings — lighter and tangier than mayonnaise alone.

Culturing: Buttermilk is a cultured product, so it keeps longer than fresh milk. A little leftover buttermilk can culture a fresh batch at home.

Freezing: Buttermilk freezes well for baking — portion and freeze for up to 3 months; thaw in the refrigerator and stir before using.

The acidity that preserves buttermilk also makes it a natural tenderizer and leavening agent, extending its usefulness beyond fresh milk.

Cultured buttermilk is surprisingly low in fat — it is made from low-fat or skim milk. A cup provides about 8g of protein, 280mg of calcium, and significant potassium, phosphorus, and B vitamins.

The lactic acid and live cultures in buttermilk support gut health and may improve lactose digestion, making it tolerable for many lactose-sensitive individuals.

Despite its name, cultured buttermilk is not high in fat or calories — a cup has about 100 calories, making it a lighter, tangier alternative to regular milk in cooking.

True buttermilk — the tangy liquid left after churning butter — is quite different from the cultured buttermilk sold in stores today, which is made by culturing low-fat milk. Both share a tangy flavor, but traditional buttermilk is thinner and more complex.

The name 'buttermilk' reflects its origin: it is literally the milk left after the butter has been taken out.

Buttermilk is essential to Southern American cooking — it is the secret behind fluffy biscuits, tender fried chicken, and moist layer cakes, where its acidity reacts with baking soda for lift.

Buttermilk is an efficient use of milk — traditionally it was the byproduct of butter-making, turning what would be waste into a valuable ingredient. Modern cultured buttermilk similarly makes a useful product from low-fat milk.

Its long shelf life (thanks to its acidity) reduces waste, and its role as a leavening agent reduces the need for other ingredients. Choosing buttermilk from local and organic dairies lowers the footprint further.