Cajun Shrimp Boil

INGREDIENTS

• 6 Tbs. Old Bay or other crab boil seasoning
• 2 large yellow onions, quartered
• 1 garlic head, unpeeled and halved crosswise
• 2 lemons, halved
• 2 lb. small red-skinned potatoes
• 4 ears of corn, each cut into thirds
• 1 1/2 lb. smoked pork or chicken sausages, cut into slices 1 inch thick
• 3 lb. large shrimp, unpeeled and tails intact