Peel, wash and halve the carrot. Peel 1 onion and also halve it. Wash the goose legs. Boil 1-1 1/2 litre of water. Add goose legs, salt, carrot, onion, bay leaf and peppercorns. Cover and cook over medium heat for 1-1 1/4 hours
Remove the goose legs from the stock (put the stock aside) and place them on a fat pan of the oven or in a large flat casserole dish. Season goose legs with salt and pepper. Roast in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 1 hour. About 10 minutes before the end of the roasting time, brush with cold salted water and roast until crispy
Peel the remaining onions and cut into rings. Wash and quarter apples, remove core. Cut the quarter in half again. Heat butter in a pan and fry onion rings and apples briefly while turning. Distribute around the legs about 15 minutes before the end of the frying time.
For the sauce, wash the thyme, shake dry, remove the leaves from the stalks, except for a little to garnish. Remove goose legs, apple slices and onion rings from the tray and keep warm. Measure 300 ml of goose stock and dissolve the roasting set with it. Pour through a sieve into a pot and bring to the boil. Stir 4 tbsp. water and starch until smooth, thicken sauce with it. Season to taste with salt, pepper, thyme and apple jelly, bring to the boil again. Put sauce and legs back into the roaster and garnish with thyme