To prepare vinaigrette, place first 5 ingredients in a blender, and process until blended. Add oil and poppy seeds, and process until blended.
To prepare salad, place 1 cup watercress on each of 6 plates. Top each serving with 2/3 cup apricot slices and 1/2 cup cherries. Drizzle 2 tablespoons vinaigrette over each salad.