1. In a medium mixing bowl, toss the prawns with 1 tablespoon of Old Bay seasoning. Set aside to marinate for 5 minutes.
2. In a large mixing bowl, combine the corn, baby potatoes, sausage, lemon, and garlic. Add the seasoned prawns to the bowl. Add 2 tablespoons melted butter, 1 teaspoon parsley, and the remaining tablespoon of Old Bay seasoning. Toss everything together until evenly coated, then let it sit for 10 minutes to absorb the flavors.
3. You can cook this shrimp boil on either a grill pan or an outdoor barbecue grill.

Option 1: Cook on a barbecue grill:

1. Brush the grill grates with olive oil or spray with nonstick cooking spray to prevent sticking.
2. Place the corn, potatoes, shrimp, sausage, and lemon directly on the grill. Grill for a few minutes per side, just until lightly charred and distinct grill marks appear.
3. Transfer the grilled items to a large disposable aluminum pan. Add the remaining melted butter and toss to coat. Cover tightly with foil, sealing the edges. Alternatively, divide the grilled ingredients onto four 12-inch sheets of aluminum foil. Spoon the remaining butter over each portion. Fold the foil over to form packets, sealing the edges by rolling them tightly.
4. Place the aluminum pan or foil packets back on the grill. Cover and cook for 15–20 minutes, until everything is cooked through and heated.

Option 2: Cook on a grill pan:

1. Brush a grill pan with olive oil and heat over medium-high heat. Arrange the items (corn, potatoes, shrimp, sausage, and lemon) in a single layer and lightly brush the tops with some of the remaining melted butter.
2. Cook for about 5 minutes, or until charred grill marks appear. Lower the heat to medium. Then, carefully flip everything, add 1 cup of water to the pan, and cover tightly with aluminum foil.
3. Simmer for another 15 minutes, or until the potatoes are tender and the shrimp are cooked through.

1. Remove from grill and sprinkle with fresh chopped parsley and a generous dusting of Old Bay seasoning before serving.