Found this on cdkitchen.com. Haven't tried it yet, somebody who cooks better than I should let me know if it's any good.
- Whisk together oil and mayonnaise.
- Add buttermilk, cheese, basil, salt, garlic, and hot pepper sauce to taste.
- Mix thoroughly.
- Cover and let flavors meld overnight in refrigerator.
- This also will make an excellent chicken marinade.