* 1 Heat coals or gas grill for direct heat.
* 2 Mix lemon juice, oil, thyme, salt and pepper. Cut scallops in half if over 1 inch in diameter.
* 3 Thread scallops, shrimp, mushrooms, tomatoes and zucchini alternately on each of four 10-inch metal skewers. Brush with lemon juice mixture.
* 4 Grill uncovered 4 inches from medium heat 10 to 15 minutes, brushing frequently with lemon juice mixture and turning once, until scallops are white and shrimp are pink and firm.