What to do with buttermilk I bought half a gallon of buttermilk last week to make some sweet bread.  I would have bought less, but half a gallon is the only quantity that my grocery store carries.  Now I have half a gallon minus one cup of buttermilk sitting in my fridge, and no idea what to do with it.  Extra bonus points if it doesn't involve the oven, because it's supposed to be pushing 90 with 100% humidity all week.