Combine all of the dressing ingredients in a small saucepan. Bring to a boil.
Reduce the heat and simmer for approximately 5 minutes, whisking regularly, until the dressing thickens slightly. Set the dressing aside and allow it to cool completely (at least 25 minutes).
MAKE THE SALAD
Wash and dry the fruit. Gently toss together all of the fruit in a large bowl.
DRESS THE SALAD
If serving the salad right away (or within 1-2 hours), pour the dressing over the fruit and toss to coat. Cover and refrigerate until ready to serve. If you plan to serve the salad later (within about 2-24 hours), it's best to wait and add the dressing until just before serving. This way the fruit stays fresh longer.
Garnish with additional lemon zest just before serving, if desired.
Notes
When zesting fruit, be sure that you're just scraping off that thin outer peel, which is where you'll find all of the flavorful essential oils. Don't scrape off any of the bitter white pith underneath the peel.
If you're adding bananas to the salad, wait and stir them into the mix just before serving. Otherwise bananas have a tendency to turn brown as they sit. Creamy and naturally sweet, bananas lend a soft texture and a touch of extra sweetness.
Wait to add the dressing until just before serving. This will help the fruit stay fresh longer, since it will break down and macerate faster in the sweet dressing.
For a nice finishing touch, garnish the salad with extra lemon zest or fresh mint leaves just before serving.