My mom made this simple dressing last night and it was delicious and light. The recipe is from the February 2009 Real Simple magazine.
1/2 cup buttermilk
2 tablespoons reduced-fat sour cream
4 tablespoons crumbled blue cheese (2 ounces)
1 head iceberg lettuce, quartered
In a small bowl, whisk together the buttermilk, sour cream, and 3 tablespoons of the blue cheese. Divide the lettuce among plates and spoon the dressing over the top. Sprinkle with the remaining tablespoon of cheese and 1/4 teaspoon pepper (I added a little salt too).
Our dressing was a little runny so I would add less than 1/2 cup buttermilk and keep adding until it's the consistency you want. Also, because there are only 3 ingredients, I think real buttermilk should be used and not subsituted with milk + vinegar. With just a few ingredients in recipes, I try to use the best quality and freshness I can find.
This was a good beginning to a meal. I also think it would be good with cucumbers and tomatoes.