– 24 cherry tomatoes

– 12 mushrooms

– 12 pearl onions

– 1 lb halibut or other firm fish (cut into 24 1-inch pieces)

– 24 sea scallops (1 lb, muscle removed)

– 24 large raw shrimp (1 lb, deveined)

– 2-3 Tbsp extra virgin olive oil

– juice of 1 large lemon

– 1 Tbsp dried minced onion

– 1 Tbsp dried tarragon or oregano

– salt, to taste

– pepper, to taste