This was pretty good. It won't become a staple because both of us prefer oil-and-vinegar or my lemon-sesame dressing, but it might appear again as a change of pace. It was pretty runny, probably in part because I subbed yogurt for mayo, and my yogurt batch was on the runny side, but I didn't mind the runniness.
Evelyn's buttermilk-dill dressing
1/2 cup buttermilk
2 tbsp yogurt
2 tbsp cider vinegar
1 tsp sugar (reduced from 1 tbsp in original recipe, but I would probably omit altogether in the future)
1 1/2 tsp dried dill, or more or less to taste
Salt and pepper to taste
Shake. Taste. Adjust.
Buttermilk used: 1/2 cup
Buttermilk bonanza total: 4 1/2 cups