Heat 20 g butter in a pan or wok, add the leek and fry for about 5 minutes. In the meantime, chop the garlic, ginger and chilli pepper and roast briefly, but do not let it burn!
Then add the sugar and let everything caramelize briefly. Deglaze with the white wine and let it boil down. Fillet the oranges and add them together with a small shot of the orange juice, simmer for approx. 1 min. Season to taste with salt and pepper.
Season the pikeperch fillet only with salt and pepper and brown on both sides in the remaining butter until golden and serve on the leek and orange vegetables. If you like, you can garnish with coriander greens or parsley.
This goes well with fresh white bread or rice. And of course a glass of white wine.