Dab roulade meat dry and cut in half crosswise. Peel onions and cut into rings. Peel carrots, beetroot and potatoes, wash briefly and cut or slice thinly. Crumble the bay leaf finely and mix with the dried oregano.
Layer the prepared ingredients with the bacon slices in a large casserole dish or casserole dish. Season each layer of vegetables, potatoes and meat with salt, pepper and the oregano mixture. Finish with slices of bacon.
Boil 300 ml of water and dissolve the stock in it. Pour in red wine and stock (the mould or pot should be about half filled with liquid). Close casserole dish with aluminium foil or pot with lid.
Braise in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for about 2 hours. Remove aluminium foil or lid 10 minutes before the end of the cooking time and cook until open. Garnish with fresh oregano.