Peel and wash the potatoes and cut them into thin slices. Cook in 1/4 l water covered with broth for about 10 minutes
Clean and wash the courgettes and cut them lengthwise into thin slices with a peeler or knife. After about 7 minutes add to the potatoes and cook. Lift out everything, keep the broth
Grate cheese. Dice ham. Wash tomato, cut into slices. Mix 6 tablespoons of stock and cream. Season with salt and pepper.
Layer the potatoes and vegetables in an ovenproof dish. Pour sauce over them. Sprinkle with ham, rosemary and cheese. Bake the zucchini gratin in a hot oven (electric cooker: 225 °C/circulating air: 200 °C/gas: level 4) for about 10 minutes
The supply of low-fat cheese is constantly increasing. It is offered in pieces, sliced or even already grated for gratinating (e.g. from Du darf darf)