Peel and wash the potatoes and cut or slice them into thin slices. Grease a gratin dish and layer the potato slices in a fan shape. Season the cream with salt, pepper and nutmeg and pour over the potatoes.
Bake gratin in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 40-50 minutes. In the meantime, wash the currants and pluck them from the stalks. Peel the shallot and cut into slices.
Wash the rosemary, shake dry and pluck. Wash the meat, dab dry. Season with salt and pepper. Heat oil in a pan. Fry the meat, rosemary and shallots for about 2 minutes, turning them over.
Place the meat on a baking tray and cook in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 8-10 minutes until medium heat. Deglaze the meat with red wine and let it simmer for about 5 minutes.
Add jelly, stock and half of the currants. Let simmer for another 2-3 minutes. Stir starch and 2 tbsp. water until smooth, thicken sauce with it and simmer for about 2 minutes. Season to taste with salt and pepper.
Add the remaining currants. Arrange meat, sauce and potato gratin.