Buttermilk* - Every buttermilk is different. Start with 1 1/2 cups, and if you feel the need to add more and that isn't enough, you can another 1/4 cup. Also, I recommend using actual buttermilk for this recipe as it helps create that biscuit texture, but if you don't have any on hand, you can make it at home. Combine 1 1/2 cups regular milk with 2 tbsp of lemon juice. Allow it to sit on your counter for 10 minutes to activate before using.