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2 lemons, halved (plus more for serving)
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½ cup seafood boil (such as Zatarain’s Crawfish, Shrimp and Crab Boil) or Old Bay Seasoning
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8 cloves garlic, roughly chopped
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1 large onion, quartered
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6 sprigs fresh thyme
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1 pound small red potatoes, halved
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14 ounce Andouille or smoked sausage, cut into 1-inch pieces
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4 ears corn, husked and cut into thirds
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1½ pounds shrimp, shell on, deveined
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2 Tablespoons unsalted butter