Avocado, Celery, and Scallions With Mache
Preparing bruschetta is as simple as making a sandwich; there's no need to measure ingredients.
Source: Martha Stewart Living, May 2010
Mix together fresh lemon juice and extra-virgin olive oil; toss some dressing with sliced scallions and celery. Place thin avocado slices on toasts. Spoon on scallion-celery mixture. Top with mache (or watercress) and coarsely chopped walnuts. Drizzle with remaining dressing.