Garlic-Roasted Halibut

Ingredients

• 20 (1 1/2 lb.) red new potatoes, cut in half
• 12 unpeeled garlic cloves
• 1 medium green bell pepper, seeded and cut into 1-inch pieces
• 1 medium red bell pepper, seeded and cut into 1-inch pieces
• 1 medium red onion, peeled and cut into wedges
• salt and pepper
• 4 (4 to 6 oz. each) halibut steaks
• lemon wedges
• rosemary-garlic butter