Sour cream is a fermented dairy product made by adding lactic acid bacteria to cream, giving it its characteristic tangy flavor and thick, spoonable texture. While it is often enjoyed as a topping for baked potatoes, tacos, and soups, sour cream also plays a key role in baking and sauces, adding moisture and richness. This article breaks down the nutritional profile of sour cream, offers a simple homemade version, and provides practical tips for using it in your kitchen.
Ingredients
- 2 cups (480 ml) heavy cream (pasteurized, not ultra-pasteurized if possible)
- 2 tablespoons (30 ml) buttermilk (or 1 tablespoon / 15 ml fresh lemon juice)
Instructions
- Pour the heavy cream into a clean glass jar or bowl. If using lemon juice, add it now; if using buttermilk, add it now as well.
- Stir gently with a clean spoon to combine.
- Cover the jar with a clean cloth or paper towel secured with a rubber band (to allow air circulation while keeping out dust), or loosely with a lid.
- Let the mixture sit at room temperature (70–75°F / 21–24°C) for 12 to 24 hours. Do not stir during this time. The mixture will thicken and become tangy.
- Once thickened to your liking, stir well, cover with a tight lid, and refrigerate for at least 4 hours before using. It will continue to thicken as it chills.
Tips
- Substitute for buttermilk: If you don’t have buttermilk, use 1 tablespoon (15 ml) fresh lemon juice or white vinegar per 2 cups (480 ml) cream. The acid will help the cream thicken, though the flavor may be slightly sharper.
- Storage: Homemade sour cream keeps for up to 2 weeks in the refrigerator in an airtight container. Always use a clean spoon to scoop it out to avoid introducing bacteria.
- Common mistake: Using ultra-pasteurized cream often results in a thinner sour cream because the high heat denatures proteins needed for thickening. If that’s all you have, add 1 teaspoon (5 ml) of powdered pectin or gelatin (dissolved in a little water) to help thicken.
- Temperature matters: If your kitchen is cooler than 70°F (21°C), the culturing process will take longer; if warmer, it may be ready sooner. Check after 12 hours and continue if needed.
Serving Suggestions
Use sour cream as a topping for baked potatoes, chili, nachos, or tacos. It also makes an excellent base for dips—mix with fresh herbs, garlic, and a squeeze of lemon for a quick onion dip. In baking, sour cream adds moisture to cakes, muffins, and scones; replace up to half the milk or buttermilk in a recipe with sour cream for a tender crumb.
Variations
- Herbed sour cream: Stir in 1 tablespoon (15 ml) chopped fresh chives, dill, or parsley after culturing.
- Spiced sour cream: Add 1/2 teaspoon (2.5 ml) smoked paprika or ground cumin for a smoky flavor.
- Vegan alternative: Use 2 cups (480 ml) full-fat coconut cream and 2 tablespoons (30 ml) lemon juice. Blend and let sit at room temperature for 12 hours; it will thicken but won’t be as tangy.
Storage and Reheating
Store sour cream in the refrigerator at or below 40°F (4°C). Homemade sour cream keeps for up to 2 weeks; commercial sour cream can last up to 3 weeks after opening if kept cold and uncontaminated. Do not freeze sour cream—it will separate and become watery upon thawing. If you have leftover sour cream that needs using, stir it into pancake batter, salad dressings, or mashed potatoes. Sour cream is not reheated; it is served cold or at room temperature. If a recipe calls for adding sour cream to a hot dish, stir it in at the end and heat gently to avoid curdling.
Frequently Asked Questions
Is sour cream healthy? Sour cream is a dairy product rich in calcium, vitamin A, and probiotics (if live cultures are present). It is high in fat and calories, so it’s best enjoyed in moderation. One tablespoon (15 g) contains about 30 calories and 3 g fat.
Can I use Greek yogurt instead of sour cream? Yes, plain Greek yogurt is a common substitute in most recipes, though it is tangier and slightly lower in fat. In baking, you may need to add a little more liquid to compensate for the thicker texture.
Why did my homemade sour cream turn out runny? Runny sour cream is usually due to using ultra-pasteurized cream, insufficient culturing time, or temperatures that were too cool. Try using regular pasteurized cream and allow up to 24 hours at a warm spot.
Can I make sour cream from milk? Traditional sour cream is made from cream, but you can make a similar product by mixing 1 tablespoon (15 ml) lemon juice into 1 cup (240 ml) whole milk and letting it sit for 10 minutes. It will thicken slightly but won’t be as rich.
Is sour cream safe to eat after the sell-by date? If unopened and refrigerated, sour cream can last 1–2 weeks past the sell-by date. Once opened, use within 3 weeks. Always check for signs of spoilage like mold, off-smell, or watery separation—if in doubt, discard.
Can I freeze sour cream? Freezing is not recommended because it changes the texture, making it grainy and watery. If you must freeze, use it in cooked dishes like soups or casseroles where texture is less critical.
Related
- Fermenting Pickles Recipe: Crisp, Tangy Dill Spears
- Fermenting Recipes for Beginners: Easy Lacto-Fermented Pickles
- Fermenting Red Cabbage: A Simple Sauerkraut Recipe
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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