2. In a heavy skillet over medium-high heat, sauté garlic with non-stick cooking spray, then add chicken stock and grapefruit juice. Bring to a boil, lower temperature to medium low and reduce to syrup. Add cilantro. Stir well and set aside. In a large bowl, combine arugula, olive oil, chopped grapefruit and pepper together. Toss the ingredients to coat arugula. Add tomatoes and papaya.