Preheat oven to 200 degrees C. Place the butter or margarine in 20x30cm glass baking dish and place in oven until butter melts.
Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente. Drain and transfer to a large serving bowl.
Stir the prawns, garlic and lemon juice into the melted butter. Return dish to oven. Bake for 3 minutes. Remove from the oven, and mix in parsley; continue baking until prawns are opaque, about 2 minutes longer. Season with salt and pepper.
Spoon the prawns and butter sauce over the linguine and toss to coat the pasta. Serve immediately.