For the pike-perch ceviche with guacamole, pluck the pike-perch fillet, rinse briefly with cold water and cut into wafer-thin slices with a sharp knife. For the marinade, mix all the ingredients and put the slices of pike-perch in it and refrigerate. After a few minutes, carefully lay out the zander slices in deep plates and sprinkle with a little coarse sea salt.
Sprinkle with celery leaves, radishes, lime cubes and chives. Arrange small mounds of whitefish caviar and a dumpling of the fresh guacamole as garnish. For this, peel the ripe avocado, mash with a fork and mix briefly with the remaining ingredients.