Preheat a grill to medium high and brush the grates with vegetable oil. Toss the chicken with the olive oil, vinegar, rosemary, garlic, red pepper flakes and salt in a large bowl. Place a cheese cube on a piece of chicken and wrap tightly with a slice of prosciutto. Repeat with the remaining cheese, chicken and prosciutto.
Thread the chicken bundles onto eight 10-inch skewers along with the tomatoes. Grill the kebabs, covered, turning occasionally, until the prosciutto is crisp and the chicken is cooked through, about 10 minutes.
Photograph by Christopher Testani
Courtesy of Food Network Magazine