Heat the olive oil in a large frying pan, add the chorizo and cook for 1 minute on each side until just golden and crisp. Remove from the pan. Add the garlic and cook for 30 seconds. Then add the prawns and cook for 3 minutes until golden.
Return the chorizo to the pan and carefully pour over the sherry. Season to taste with salt and pepper. Cook for 1 minute, then scatter over the parsley and serve with plenty of crusty bread.