Ingredients

2 lemons 

6 tablespoons nonfat buttermilk 

3 tablespoons nonfat yogurt 

1 medium shallot, finely chopped 

Salt and freshly ground pepper 

Preparation

Using the smallest holes of a box grater, remove zest from 1 lemon; set aside. Squeeze juice from both lemons, yielding 4 tablespoons. In a small bowl, whisk together buttermilk, yogurt, zest, juice, and shallot; season with salt and pepper. Store in an airtight container, refrigerated, up to 3 days.