Cucumber & Tomato Salad

Cucumber and Tomato Salad with Buttermilk Dressing

2 cups mayonnaise
1 1/2 cups well-shaken buttermilk
2 tablespoons white-wine vinegar
1/2 cup finely chopped fresh chives
6 medium cucumbers, peeled and cut into 1-inch pieces
8 beefsteak tomatoes, cut into 1/2-inch wedges
2 heads iceberg lettuce, cored and cut into 2-inch chunks

Whisk together mayonnaise, buttermilk, vinegar, and salt and pepper to taste until smooth, then whisk in chives.
Put cucumbers, tomatoes, and lettuce into bowls and serve with dressing.