Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Prepare the oven hose according to the instructions on the package. Wash the thick rib, dab dry. Season with salt and brush with honey all around.
Place in the oven bag, add 2 tablespoons of water. Close the roasting hose and place it on a baking tray. Cook in a hot oven for approx. 1 1⁄2 hours.
For the gratin leek clean, wash and cut into fine rings. Peel garlic and chop finely. Heat 1 tbsp. butter. Sauté leek and garlic in it. Season with salt, pepper and nutmeg.
Peel and wash the potatoes and slice them into thin slices. Layer potato slices and leek vegetables alternately in a greased ovenproof dish. Mix cream and stock and pour so much over it that everything is just covered.
Grate the parmesan directly over it. Place the gratin on the oven bottom under the roast after 1 hour roasting time.
After 1 1⁄2 hours, switch the oven temperature up (electric oven: 200 °C/circulating air: 175 °C/gas: see manufacturer). Remove the roast from the oven hose, collecting the cooking juices. Place the gratin on the tray, add the roast and continue cooking for 15 minutes.
For the beans clean and wash the cutting beans. First halve them crosswise, then cut into thin strips. Cook in boiling salted water for about 5 minutes. Drain. Peel and halve the onion and cut into thin strips.
Cut the bacon into long strips and fry them crisply in a pan without fat. Fry the onion rings briefly. Add the beans and toss in.
If necessary, reheat the stock and season with salt, pepper and honey. Serve everything.