Melon, Mango, and Avocado Salad

INGREDIENTS

• 1 small red onion, very thinly sliced
• 2 tablespoons red wine vinegar
• 1/2 cup freshly squeezed orange juice
• 2 teaspoons extra-virgin olive oil
• 1 tablespoon grated orange zest
• 1/4 teaspoon kosher salt
• freshly ground black pepper
• 2 cups small cantaloupe balls
• 2 cups 1/2-inch diced seedless watermelon
• 1 ripe mango, cut into 1/4-inch dice
• 1 cup loosely packed cilantro leaves
• 2 ripe Hass avocados
• 1 tablespoon fresh lime juice
• 6 thin lime slices