Clean, wash and chop the zucchini. Wash cherry tomatoes, possibly cut in half. Peel onions and cut into slices. Wash the sage, pluck 12 leaves and put the rest aside.
Cut the ham slices in half lengthwise. Wash the fish, dab dry and cut into 12 equally sized pieces. Season with salt and pepper. Cover each piece with 1 sage leaf and wrap 1 slice of ham around it.
Fix it with wooden skewers.
Heat 1 tablespoon of oil in a large frying pan. Fry the vegetables for 7-8 minutes, turning occasionally. Season to taste with salt, pepper, vinegar and sugar.
At the same time heat 1 tablespoon of oil in a second pan. Fry the fish-saltimbocca in it for about 3 minutes on each side until golden brown. Arrange everything and garnish with remaining sage. Ciabatta bread goes well with it.