Making a DIY buttermilk substitute is as simple as combining milk and your choice of 3 different acids. This easy-to-follow guide will get you homemade buttermilk no matter which option you choose.
In a large glass measuring cup, add the appropriate amount of vinegar. Pour in the milk until it reaches the 1 cup line. Allow it to sit for up to 10 minute.
Take a lemon, cut it in half and squeeze out the amount you need into a measuring cup. Fill the cup with milk and let it sit for up to 10 minutes. Use as desired.