How to Make It
Preheat grill to high (450°F to 500°F) and lightly oil grates. Brush pork, zucchini, and onion with 1 tablespoon oil; season all over with cumin and ½ teaspoon each salt and pepper. Grill pork, covered, flipping once, until a thermometer inserted in thickest portion registers 140°F, about 4 minutes per side. Transfer to a plate and tent with foil.
Grill zucchini and onion, uncovered, flipping once, until lightly charred and tender, about 2 minutes per side. Transfer to a cutting board. Cut zucchini in half; chop onion and transfer to a medium bowl.
Stir together grilled onion, mango, cilantro, lime juice, honey, and remaining 2 tablespoons oil, ½ teaspoon salt, and ¼ teaspoon pepper. Serve pork and zucchini with mango salsa.