1 cup strawberries, hulled, rinsed, quartered
1 cup green seedless grapes
1/3 cup walnuts, toasted and coarsely chopped
1 large stalk celery, chopped
1 1/2 tablespoons mayonnaise
1 1/2 tablespoons plain Greek yogurt
lettuce for serving
Gently toss all ingredients together except the lettuce. Serve atop a bed of lettuce, if desired.