So I have come across a lot of cupcake recipes that I needed that used oil instead of butter. Thanks forum. Here's the question I notice a lot of red velvet cupcakes use vinegar a very small amount usually like a teaspoon or so. I was wondering WHY? What does it do for the cupcake? Vinegar is definitely not an ingredient I would think you would add to something sweet but I guess I am wrong. If omitted what's the difference. I use the recipe that don't call for vinegar. Any way just wondering.