low country boil recipe

4 quarts water - 1/4 cup Old Bay seasoning - 1 tablespoon kosher salt - 2 pounds baby red potatoes - 4 ears corn, shucked and cut into halves - 1 pound smoked sausage, cut into 2-inch pieces - 2 pounds large shrimp, peeled and deveined - 1 lemon, halved - 1/4 cup butter, melted - Fresh parsley, chopped (for garnish, optional) - Lemon wedges (for serving) - Hot sauce (for serving)