13/05/2026
Before anyone says it, yes, you can walk into a store and pick up a carton of buttermilk. But a large number of people in this community cannot, because depending on where you live, cultured buttermilk simply isn't something that shows up on supermarket shelves. This post is for those people, and honestly for anyone who has ever run out mid-recipe and needed a quick solution without leaving the kitchen.
If this is your first time on my page, welcome. Give this post a like so more people get to see it, follow Neme's Kitchen along so you don't miss the next one, and save this one for reference because it's the kind of thing you'll want to find quickly when you're mid-bake. If you have questions, drop them in the comments. I read every one and the ones that come up most often become the next post.
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First, let's talk about what buttermilk actually does in baking, because once you understand that, everything else makes more sense.
Buttermilk is acidic, and that acidity does several things at once inside your batter or dough. It reacts with baking soda to produce carbon dioxide, which gives your baked goods lift and a tender, open crumb. It also weakens gluten slightly, which is what makes buttermilk cakes and biscuits softer than their regular-milk counterparts. And it adds a subtle tang that balances sweetness and adds a layer of flavour complexity that's difficult to achieve any other way.
It shows up in a wide range of baked goods: fluffy pancakes and waffles, tender biscuits and scones, red velvet cake, chocolate cake, pound cake, Bundt cake, banana bread, quick breads, muffins, doughnuts, and even some cookies. Any time a recipe is trying to achieve a particularly soft crumb, a good rise, or a slight tang, there's a good chance buttermilk is involved.
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Now let's talk about the three types, because they are not interchangeable in the way most people assume.
The buttermilk sold in stores in the US, UK, and most Western countries is cultured buttermilk. It's made by introducing live bacterial cultures into fresh milk and allowing them to ferment it, much like how yoghurt is made. That fermentation process is what creates the acidity, the thick texture, and the tangy flavour that baking recipes depend on. This is the gold standard for baking because it's consistent, reliably acidic, and behaves predictably in recipes.
The homemade substitute, which is what the visual guide attached to this post shows you how to make, is achieved by adding an acid to regular milk and letting it sit for 5 to 10 minutes until it curdles and thickens slightly. Lemon juice, white vinegar, and cream of tartar all work. The result isn't identical to cultured buttermilk, but for the vast majority of baking recipes the difference is negligible. The acidity is there, the curdling mimics the texture, and your baked goods will rise, tenderise, and behave the way the recipe intended.
Then there's the original buttermilk, the liquid left behind after cream is churned into butter. This is what the word "buttermilk" historically referred to, and it's still produced in traditional butter-making processes. But here's the important thing to understand: this type has not been cultured or fermented. It's much thinner, closer to skim milk in consistency, and lacks the acidity that baking recipes require. Using it as a direct substitute for cultured buttermilk in a recipe will not give you the same results, and in recipes that depend on that acid-leavening reaction, it can noticeably affect the rise and texture of what you're baking.
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So if you can't find cultured buttermilk where you live, the substitute works.
Use the ratios in the guide: one cup of milk combined with either one tablespoon of lemon juice, one tablespoon of white vinegar, or two teaspoons of cream of tartar. Stir, leave it alone for 5 to 10 minutes, and use it in place of buttermilk in your recipe. That's it. No special equipment, no hard-to-find ingredients, just something that's almost certainly already in your kitchen.
End of post.
As always, I hope this helps someone.