Add the beer, water, seasoning and garlic to a large Dutch oven or pot, stir to combine. Add the potatoes and bring to a low simmer, stirring occasionally. Simmer for 10-12 minutes or until potatoes are nearly cooked and all the way soft.
Add the shrimp and onions. Cover and steam for 6-7 minutes or until shrimp turn pink and start to curl. See chart for cooking times based on shrimp size.
When cooked, immediately remove to a platter and serve with fresh lemon wedges and desired dipping sauce.
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