low country boil recipe

Ingredients: 4 quarts water 1/4 cup Old Bay seasoning 2 pounds small red potatoes 4 ears corn, husked and cut into thirds 2 pounds smoked sausage, cut into 2-inch pieces 2 pounds shrimp, deveined and in shells 1 lemon, quartered 1/4 cup melted butter (optional, for serving) Fresh parsley, chopped (for garnish)