Bratwurst with Rösti and Onion Sauce

BRATWURST CAN BE BOUGHT FROM SOME SPECIALIST DELIS, AND YOU OCCASIONALLY SEE THEM IN SUPERMARKETS. They make a change from normal bangers, and with a good onion sauce and a crisp potato rösti they make a fun, surprise dinner-party dish. Anton Mosimann often serves them at his chef reunion dinners, and they are remarkable and hit the spot for hungry alcohol-fuelled chefs. You can lightly score the bratwurst, i