Prepare as above, except cut unpeeled apples into bite-size pieces; place in a mixing bowl and toss with lime juice or lemon juice. Add the melon cut into bite-size pieces, the grapes and, if you like, the pistachios or almonds. Fold in the salad dressing. Serve on lettuce leaves. Makes 8 side-dish servings.
Prepare the salad dressing as directed. Cover and store in the refrigerator for up to 5 days.
If you can't find any melon in your grocery store during the winter, you can just substitute another fresh fruit.