Divide the pike-perch fillet into 4 equally sized pieces, season with salt and pepper. Then turn it in flour and egg and bread it with the Panko breadcrumbs.
For the yuzu sauce, mix the egg yolk, yuzu juice and powder, mustard, caper stock, capers, garlic and sugar with a blender and then slowly add 100 ml of oil. To refine and to achieve the desired consistency, mix in some more olive oil.
Season to taste with salt and sugar.
Fry the zander fillets in a frying pan in plenty of hot oil until golden brown and crispy.
Cut endive salad leaves into fine strips and mix with the yuzu sauce. Cut the rolls in half crosswise, spread the salad with the sauce on both halves. Place fried pike-perch between the bread halves and serve.