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Place corn in a single layer on a large plate; freeze until ready to use, about 1 hour.
Meanwhile, add water to a large (16-quart) stockpot. Squeeze juice from lemon halves into water, removing and discarding seeds; add squeezed lemon halves, onions, jalapeños (if using), Old Bay, salt, cayenne, garlic heads, and bay leaves. Cover and bring to a boil over high. Add potatoes. Cover pot, and return to a gentle boil over high. Uncover, and boil, undisturbed, for 15 minutes. Add clams and sausage. Cover pot, and return to a gentle boil over high. Uncover, and boil, undisturbed, for 5 minutes. Remove from heat.
Add crab legs, shrimp, and frozen corn to stockpot, using tongs to incorporate them into the broth. Cover pot, and let mixture stand, undisturbed, 15 minutes.
Meanwhile, make the Old Bay Butter Sauce: Bring water to a boil in a medium saucepan over high. Reduce heat to low; gradually add butter pieces, whisking until mixture is emulsified and thickened (do not let sauce boil). Remove from heat; stir in parsley, Old Bay, lemon juice, hot sauce, Worcestershire, and cayenne and transfer to a sauceboat or small serving bowl.
Working in batches, drain the seafood boil in a colander, using tongs to help transfer ingredients to the colander and then to a serving platter. Serve the seafood boil alongside the warmed Old Bay Butter Sauce.