Wash the beef and pat dry. Rub the roast all around with salt and pepper. Line the casserole with the slices of bacon and place the roast on top.
Peel and roughly chop the onions. Peel and dice the carrot. Put both in the casserole with the bay leaf, peppercorns and cloves. Pour on the beer and meat stock. Mix the vinegar with turnip tops and stir into the beer mixture.
Cover the pot and simmer the roast for 90-120 minutes. Take the meat out of the pot and keep it warm. Strain the braised stock through a sieve. Brown the flour in butter and deglaze with the stock. Let the whole thing boil for about 8 minutes and season with salt, pepper and vinegar.
Cut the meat into slices and serve with sauce. Any salads or vegetables and boiled potatoes or potato dumplings go well with it.