Make the cabbage the day before. Shred the leaves & slice the onion. Mix with walnut and olive oil. If you do not have walnut oil substitute with olive oil, hazelnut oil, or sunflower oil. Add sugar, apple, vinegar and water. Stir and season. Refrigerate for 24 hours, stirring twice.
Step 2 : Cook the venison
For the venison, season the loins with salt and pepper. Heat a frying pan. Add a tbsp oil. Sauté until the skin is seared and brown. Reduce the heat and add 20g butter. Roll the meat in the butter. Cook for 8-10 mins to medium rare. Remove and rest.
Step 3 : Cook the sauce
Tip out the fat into a small pot for the sauce. Add 30g butter and apples. Toss to colour. Add the sugar. Cook to a golden caramel; add the wine. Boil briefly to form a sauce, stirring in the stock and peppercorns. Finish with 2-3 drops of red wine vinegar and add any juices from the resting meat.
Step 4 : To serve
Slice the venison and serve with the glazed apples around and some drained cabbage. Serve with your favourite potatoes.