Pierce the meat lengthways with a knife and a wooden spoon handle, insert 12 plums and wrap the roast with kitchen twine. Rub with salt, ginger and pepper.
Place the roast in a roasting pan, add the apple wedges, onion quarters, 4 plums, water and soy sauce and simmer uncovered in a preheated oven at 225 ° C for approx. 1 hour.
Then remove the roast set, pass through a sieve, fill up to 3/8 l with water, bind with the flour mixed with a little water and season to taste.