Clean and wash the pointed cabbage. Carefully remove 4 large leaves and blanch in plenty of boiling salted water for about 2 minutes. Remove, rinse with cold water and drain. Cut the leaves in half lengthwise, cutting the thick vein of the leaves away.
Cut the rest of the cabbage into fine strips from the stalk.
Rinse the fish, dab dry and cut the fillets in half crosswise. Season with salt and pepper. Cover each with 1/2 pointed cabbage leaf. Spread 1 tsp. pesto on each and roll up. Fix with wooden skewers.
Wash the thyme. Pour fish stock, wine and Pernod into a deep pan. Add thyme, peppercorns and 1/2 teaspoonful of salt. Bring to the boil and reduce the heat. Place fish rolls in the stock, cover and cook for about 10 minutes.
In the meantime peel and finely dice the onion. Heat the butter in a wide saucepan. Sauté diced onion in it. Add pointed cabbage strips and about 5 tbsp. water. Season with salt and pepper. Cover and stew at low heat for about 10 minutes.
Carefully remove the rolls from the stock and keep warm in a hot oven (approx. 75°C). Pour the stock through a sieve into a small pot, bring to the boil and boil down at high heat for about 5 minutes. Stir in crème fraîche and the rest of the pesto.
Season sauce and pointed cabbage with salt and pepper. Serve with the zander rolls. Serve with rice.