For Pork Chops: Preheat grill over high heat. Stir together olive oil, lime juice, garlic, cumin, lime zest, 1 teaspoon kosher salt and 1/2 teaspoon pepper. Rub marinade evenly on pork chops, and set aside while you make the salsa.
For Salsa: Stir together tomatoes, grapes, onion, cilantro, olive oil, lime juice, 1 teaspoon kosher salt and 1/2 teaspoon pepper. Set aside.
Grill the chops, turning once, until grill marks appear and pork is just cooked through, about 6 minutes total. Transfer to a platter, and top chops with salsa. Serve.
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