In a small bowl combine vinegar, olive oil, rosemary, cumin, coriander, black pepper, and red pepper. On eight 6-inch skewers alternately thread carambola and onions. Set aside.
Grill the chicken on the rack of an uncovered grill directly over medium heat for 12 to 15 minutes or until chicken is tender and no longer pink, turning and brushing once with the vinegar mixture. Place kabobs on grill rack next to chicken the last 5 minutes of grilling, turning and brushing once with vinegar mixture.
Serve chicken and kabobs over rice. If desired, drizzle with preserves. Makes 4 servings.