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Let's talk about buttermilk for a minute.Over the past year or so I've slowly become convinced that buttermilk is one of the most underrated ingredients at the grocery store. It used to be one of those things that I'd see at the store and wonder who ever bought it, but now I totally get it.What is buttermilk? Well, it's not milk with butter added to it (in case you were wondering). It's a cultured milk product, like yogurt or kefir. Basically, a specific type of bacteria has been introduced to the milk and allowed to grow. As the bacteria grows, it eats up the natural milk sugars and produces an acid byproduct. The acid denatures the milk proteins, causing the texture to thicken up - just like when heat denatures the proteins in egg whites and turns them from a liquid into a solid. All of this "culturing" action produces a unique, tangy flavor and thick, creamy texture.Buttermilk is useful in baking because of its acid pH, which can help leaven muffins, biscuits, and other baked goods. There are many ways you can substitute buttermilk if you don't have any on hand (see a few options here ), but the problem with these substitutes is that, while they do provide acid, they do not provide that unique buttermilk flavor.And boy, oh boy does buttermilk ever have a unique flavor. Granted, I could never drink a glass of it plain (some people enjoy it that way), but when used in recipes it adds the mostflavor. Substitutions no longer cut it for me. I need the real thing.The other awesome thing about buttermilk is its rich and creamy texture. The thick texture is a result of the culturing process and not the fat content, so even if you buy a low-fat buttermilk it will still add a thick, creamy texture to whatever you're using it in. That's abonus when making dips, dressings, and soups.But what are you gonna do? Buy a whole quart of buttermilk, use a cup, and then let the rest go bad in the back of your fridge? I'll admit, I've done that a few times. But then I came across this little gem of a technique! Freezing buttermilk is easy and it's as good as fresh once thawed!So, promise me that the next time you come across a recipe that calls for buttermilk, you'll actually go buy a quart, use it, and then freeze the rest. Because you're going to love it.

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