Every Southern cook needs a good buttermilk salad dressing in her arsenal. And this one is as versatile as they come. Mayonnaise gives the dressing body and buttermilk lends its signature tanginess, while a little fresh lemon juice adds a sunny note. We add garlic and chopped chives for a Ranch-like flavor, but if you want to go even more in that direction, add finely chopped scallions, basil, and parsley. This dressing tastes great on just about any salad—even plain old lettuce!