<<Disclaimer: Verify this information before applying it to your situation.>> Hi all, I neglected to tell how to make sour milk. Add 1 tsp of vinager to the milk and let sit about 5 minutes, or use sour milk as long as it's not curdled (careful, everytime you get sour milk you'll want to make this cake). Or you can use buttermilk. Cindy in Texas.