Cook the pasta according to package directions. Drain, douse with cold water, drain again and set aside.
While the pasta cooks, prepare the prawns. Remove the heads, peel off the shell and tail. Make an incision along the back and remove the black vein that runs across the length of the prawn (see illustration). If you wish, you can cut each prawn in half lengthwise.
Crush the garlic, remove the skins then finely chop.
Roughly chop the parsley.
Heat the butter in a large sauce pan.
Add the garlic and cook until lightly browned.
Pour in the cream, lower the heat and bring to simmering (not boiling) point. Add the prawns and simmer for about 3 minutes.
Add the parsley and grated cheese. Stir until the cheese melts. Season with salt and pepper.
Add the cooked pasta to the sauce and toss to coat the noodles well. Transfer to a serving platter and serve at once.