Can be prepared in 45 minutes or less.

Ingredients

　　1/2 cup buttermilk

　　1/4 cup mayonnaise

　　1 garlic clove, minced and mashed to a paste with 1/4 teaspoon salt

　　1/2 teaspoon English-style dry mustard, or to taste

　　1/4 teaspoon dried tarragon or to taste, crumbled

　　1 large head red-leaf lettuce, rinsed, spun dry, and torn into pieces

　　1 bunch watercress, coarse stems discarded and sprigs rinsed and spun dry

　　1/2 small red onion, sliced thin

　　In a small bowl whisk together buttermilk, mayonnaise, garlic paste, mustard, tarragon, and salt and pepper to taste until smooth. In a large bowl toss lettuce, watercress, and onion with dressing.