*I love making homemade buttermilk or "sour milk" which is just some lemon juice or vinegar added to regular milk until it curdles. Since I only seem to be able to find lowfat buttermilk and I wanted full fat for this ice cream, I opted to just DIY it with some half and half. Either option works.
**adding the vodka is optional but it really helps keep the ice cream from freezing too hard!