For the filling, wash and drain the raisins. Clean the cabbage, wash, quarter and cut into strips from the stalk. Peel onion and garlic, dice finely.
Heat the oil in a pot. Sauté onion and garlic in it. Steam red cabbage for about 5 minutes. Deglaze with juice. Stir in the raisins, 1⁄2 tsp salt, 1 tsp sugar and 1⁄2 spread tsp cloves. Bring to the boil, cover and stew for about 30 minutes.
Peel, quarter, core and finely dice the apple. Stir into the cabbage and braise for about 30 minutes. Cool and drain if necessary.
Take the dough out of the refrigerator and let it rest at room temperature for about 10 minutes. Roast the pine nuts in a pan without fat until golden brown, take them out and chop them roughly. Crumble the feta. Mix the pine nuts, except for 1 tbsp, and the feta with the red cabbage.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Line a baking tray with baking paper. Melt butter. Place 4 pastry sheets slightly overlapping to form a square (approx. 50 x 50 cm) on a damp tea towel and brush with some butter.
Place another 4 leaves on top and brush with butter. Place the remaining leaves in the middle and also brush with butter.
Spread the red cabbage filling on the lower third of the pastry sheet, leaving a small rim free. Whip the edges of the dough inwards. Carefully roll up the strudel using a tea towel. Place the strudel on the tray with the seam side down.
Spread with the rest of the butter and sprinkle with the remaining pine nuts. Bake in a hot oven for about 25 minutes.
For the dip, mix yoghurt and 1 teaspoon curry, season with salt and pepper. Remove the strudel, let it cool down briefly, then cut into slices. Add the yoghurt-curry dip.