| 1. | Cut 2 of the oranges into 8 wedges each. Peel and section remaining 2 oranges; reserve sections. Mix all Orange Marinade and Dressing ingredients; reserve half for dressing. In shallow glass or plastic dish or heavy-duty resealable food-storage plastic bag, place shrimp and remaining marinade. Cover dish or seal bag and refrigerate 15 minutes. |
| 2. | Heat coals or gas grill for direct heat. Cut one onion half into wedges; separate into pieces. Thinly slice remaining onion half; separate into pieces and set aside. Remove shrimp from marinade; reserve marinade for basting. Thread shrimp, orange wedges and onion wedges alternately on each of eight 8-inch or four 15-inch metal skewers, leaving space between each piece.
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| 3. | Grill kabobs uncovered 4 to 6 inches from medium heat 6 to 8 minutes, turning frequently and brushing with reserved basting marinade, until shrimp are pink and firm. Discard any remaining basting marinade. |
| 4. | In large bowl, gently toss spinach, reserved orange sections, reserved thinly sliced onion and reserved dressing. Serve with kabobs.
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