What Is Buttermilk? Uses, Benefits, and How to Make It
Discover buttermilk’s unique properties, culinary uses, and how to substitute or make it at home with practical tips for every kitchen.
What Is Buttermilk?
Buttermilk is a tangy, creamy liquid long treasured in baking and cooking for its distinctive flavor and beneficial properties. Today, it’s a staple ingredient in many kitchens, but its origins, uses, and varieties may still surprise home cooks and professionals alike. Whether you’re mixing up flaky biscuits or marinating chicken, understanding buttermilk’s characteristics will help unlock its culinary potential.
What Exactly Is Buttermilk?
Despite the name, buttermilk contains little or no butter. It refers to two distinct but related dairy products: traditional (old-fashioned) and cultured (modern) buttermilk. Both are slightly tangy and mildly thick, but they result from different production methods.
- Traditional Buttermilk: The liquid left over after churning whole milk or cream into butter. It’s thin, tangy, and contains traces of butterfat and milk solids.
- Cultured Buttermilk: The more common variety in modern grocery stores, made by adding lactic acid bacteria to pasteurized milk. The bacteria ferment the lactose, thickening the milk and giving it the characteristic tartness.
Most buttermilk found in stores today is cultured buttermilk—a fermented product similar to yogurt, but pourable and with a milder taste.
Traditional vs. Cultured Buttermilk
Knowing the difference between these types offers valuable context for recipes and substitutions.
| Traditional Buttermilk | Cultured Buttermilk |
|---|---|
| By-product of butter making from cream or whole milk | Pasteurized milk fermented with lactic acid bacteria |
| Thin, slightly tangy, contains minimal fat | Slightly thick, more pronounced tang, usually fat-free or low-fat |
| Mostly found fresh on farms or specialty shops | Readily available in supermarkets |
Even though the two versions differ in production and texture, they can be used interchangeably in most baked goods and cooking applications.
What Does Buttermilk Taste Like?
Buttermilk is known for its pleasant tartness—slightly sour, yet creamy. The cultured version offers a yogurt-like tang, while the traditional type tends to be milder and thinner. This acidity is what makes buttermilk so valuable in many recipes, as it reacts with baking soda or baking powder to yield fluffy textures, especially in baked goods.
How Buttermilk Is Made
The production process of buttermilk determines its taste, thickness, and culinary uses.
Traditional Buttermilk Process
- Starts with whole milk or cream, allowed to ferment slightly at room temperature.
- The milk is churned, separating the solid butter from the liquid fraction.
- The leftover liquid is drained off and used as buttermilk—typically thin and a bit tart.
Cultured Buttermilk Process
- Pasteurized, often low-fat or fat-free milk is inoculated with lactic acid bacteria.
- The bacteria ferment the milk, thickening it and developing a tangy flavor.
- The finished product is chilled and bottled for sale.
Because of modern food safety and production practices, the majority of commercial buttermilk is of the cultured variety.
How Buttermilk Is Used in Cooking and Baking
Buttermilk’s distinctive flavor and acidity lend themselves to a broad range of culinary applications. Its ability to tenderize, add lift, and impart moisture is prized by chefs and bakers alike.
Baking
- Biscuits: The quintessential use for buttermilk, creating light, flaky layers and rich flavor.
- Pancakes and Waffles: Acidity reacts with baking soda or powder, giving them rise, tenderness, and a subtle zing.
- Cakes and Quick Breads: Adds moisture and balances sweetness, producing a tender crumb and subtle tang.
- Muffins and Scones: Ensures delicate texture and nuanced flavor depth.
Cooking
- Marinades: Buttermilk is a traditional base for soaking chicken, especially in fried chicken recipes; its mild acids and enzymes help tenderize proteins and add subtle flavor.
- Dressings and Dips: Classic ingredients in ranch and creamy dressings, offering tang and creaminess without heaviness.
- Soups and Sauces: Adds richness and gentle acidity to chilled soups and savory sauces.
- Batters: Enhances flavor and structure in batters for onions rings, fish, or fritters.
Why Buttermilk Is Important in Baking
Buttermilk’s key role in baking is its acidity. When combined with baking soda or baking powder, it starts a chemical reaction that produces carbon dioxide, helping doughs and batters rise. The result: remarkably fluffy and light textures in biscuits, cakes, and breads.
- Buttermilk’s acidity helps tenderize gluten, making baked goods less tough.
- Moisture content keeps treats soft and prevents them from drying out quickly.
- The taste balances sweetness, creating a more complex flavor profile.
Classic Southern recipes—especially biscuits—nearly always call for buttermilk, but it’s just as essential in pancakes, cornbread, and Irish soda bread.
How to Make a Buttermilk Substitute
If you’re out of buttermilk, don’t panic. It’s easy to make a buttermilk substitute at home using common kitchen ingredients:
Step-by-Step: Quick Homemade Buttermilk
- Pour 1 cup of milk (preferably whole or 2%) into a measuring cup.
- Add 1 tablespoon of lemon juice or white vinegar to the milk.
- Stir, then let sit for 5-10 minutes at room temperature. The milk will thicken and curdle slightly.
- Use as you would buttermilk in any recipe.
This mixture mimics the acidity found in store-bought buttermilk. You can also use plain yogurt—thin 3/4 cup yogurt with 1/4 cup milk to make 1 cup of buttermilk substitute.
Other Buttermilk Alternatives
- Kefir: A pourable, tangy yogurt drink that can often be used in a 1:1 ratio for buttermilk in recipes.
- Sour Cream: Thinned with a splash of milk to resemble buttermilk’s consistency.
How to Store and Handle Buttermilk
Proper storage ensures your buttermilk stays fresh and safe for use in recipes:
- Refrigeration: Store buttermilk unopened or resealed tightly in the coldest part of your refrigerator.
- Shelf Life: Most commercial buttermilk will last for up to 2 weeks past the date indicated on the carton if stored properly. An off smell, separation, or curdling is a sign to discard it.
- Freezing: You can freeze buttermilk in airtight containers for up to 3 months. Thawed buttermilk works well in baking, though texture may change slightly for drinking or dressings.
Is Buttermilk Nutritious?
Despite its tangy taste, commercial buttermilk is typically low in fat—especially when produced from skim or low-fat milk. It is a modest source of calcium, potassium, vitamin B12, and probiotics, thanks to bacterial fermentation. Traditional buttermilk may contain more fat depending on how thoroughly the butter was extracted.
- Low in calories compared to whole milk or cream.
- Contains beneficial bacteria that can aid digestion (in cultured forms).
- Some brands may be fortified with vitamins A and D.
Buttermilk in Global Cuisine
Buttermilk isn’t limited to biscuits and pancakes. Cultures around the world savor its refreshing, tangy qualities:
- India: Buttermilk, or chaas, is a cooled, spiced beverage, often enjoyed with salt, cumin, and herbs.
- Middle East: Frequently included in yogurt-based sauces and cold soups.
- Eastern Europe: Drank plain or mixed with fruits and vegetables for a hydrating drink.
Cooks worldwide use buttermilk or similar cultured dairy to tenderize meats, enrich batters, and balance spicy foods with its cooling acidity.
Common Questions About Buttermilk
Is buttermilk the same as milk and lemon juice?
No, but adding lemon juice or vinegar to milk is a reliable substitute for buttermilk’s acidity in recipes. Store-bought cultured buttermilk is thicker and contains live bacterial cultures, producing tang and texture beyond what the home version achieves.
Can I use non-dairy milk to make buttermilk?
Yes. Add 1 tablespoon of lemon juice or vinegar to 1 cup of soy, almond, or oat milk to mimic the acidity. This substitute works for most baked goods, but flavor and consistency will be slightly different.
What happens if I use regular milk instead of buttermilk?
Recipes calling for buttermilk rely on its acidity for leavening and flavor. Using regular milk may result in denser baked goods and a less complex taste. For best results, always use buttermilk or an acidic substitute.
Why is my buttermilk separated or lumpy?
Natural separation is common; simply shake the container before using. However, if there’s a sour odor or visible mold, discard it.
Tips for Cooking and Baking with Buttermilk
- Always shake buttermilk before measuring, as it may separate in the carton.
- If a recipe calls for both buttermilk and baking soda, don’t skip either—together they create the lift needed for fluffy results.
- Store leftover buttermilk in the refrigerator; freeze in ice cube trays for easy use in future recipes.
- Experiment by substituting buttermilk for milk in pancakes or cornbread for an instant flavor and texture boost.
- Use buttermilk as a marinade base for tenderizing meats, especially poultry.
Frequently Asked Questions (FAQs)
Q: Is buttermilk suitable for people with lactose intolerance?
A: Cultured buttermilk contains less lactose than regular milk, since bacterial cultures digest some of the sugar, but sensitive individuals may still react. Lactose-free buttermilk alternatives are available, or you can make your own using lactose-free milk and lemon juice.
Q: Does buttermilk taste sour when baked?
A: Buttermilk’s tang mellows during baking, leaving a subtle, pleasant acidity without an obvious sour flavor.
Q: Are there vegan buttermilk options?
A: Yes. Make vegan buttermilk by adding lemon juice or vinegar to plant-based milks such as soy, almond, or oat. Use as you would dairy buttermilk in most recipes.
Q: What can I do with leftover buttermilk?
A: Use it in baked goods, pancakes, marinades, creamy salad dressings, or freeze for later use.
Q: Is buttermilk healthier than regular milk?
A: Buttermilk is often lower in fat and calories and contains probiotics, especially in cultured forms. Nutritional content varies by processing method and brand.
