To make the Fruit Salad: Place the orange zest, orange juice, and lemon juice in a large bowl.
Cut the apple, pear, banana, peach, nectarine, and melon into cubes, adding the fruits to the bowl as you cut them to prevent discoloration.
Add the remaining fruits. Stir, coating the fruits with the juices, then cover the bowl with plastic wrap and refrigerate for at least 2 hours.
Mix thoroughly before serving.
To make the Honey-lime Dressing: In a medium bowl, whisk together the honey and lime juice until smooth.
To make the Pound Cake Croutons: Heat the oven to 350º. With a long, sharp knife, slice the pound cake into cubes.
Place them on a baking sheet and bake for 12 minutes, turning twice, until golden.
Melt the butter in a large skillet over medium heat. Stir in the mint, if using, then add the toasted pound cake.
Sauté for 1 to 2 minutes or until golden.
Spoon the salad into serving bowls, drizzle it with the Honey-lime Dressing, and then top with Pound Cake Croutons. Makes about 6 cups.