95% is the preparation. Melt a lot of unsalted butter in the bottom of a frying pan. Add 2 sliced garlic gloves and 1 large, mild chilli. Season with salt and pepper. Heat through gently. Add the juice from one large lemon. Add the crab or lobster. Warm through, don't cook. Add the cooked linguini. Toss through. Add some of the leftover pasta water to add a sheen. Add a large handful of chopped parsley and grated parmesan. Toss through. Serve, topped with the leftover parmesan and chopped parsley.