Classic Daube of Beef

• 1 onion, peeled and thinly sliced
• 3 celery stalks, trimmed and cut into batons
• 2 tablespoons ex

In a frying pan fry the onion and celery in the oil until the onion is golden brown. Transfer to a casserole. Dust the meat in the seasoned flour and brown it in the frying pan. Add it to the casserole. Pour the wine into the frying pan and boil it up, scraping up any cooking residues. When reduced by about a third, pour it over the beef. Cut the zest into fine shreds and stir it and the juice