Finely dice the cucumbers for the tartar sauce. Mix mayonnaise, yoghurt and 2-3 tbsp. cucumber water (glass). Stir in the cucumbers. Season to taste with salt and pepper. Wash the rosemary, dab dry and tear up.
Clean, wash and slice the zucchini. Peel garlic. Chop half finely. Heat oil in a large frying pan. Fry the zucchini slices for about 4 minutes while turning. 1-2 minutes before end of cooking time garlic,
Season with salt and pepper. Arrange zucchini vegetables and roast beef on plates. Add tartar sauce. Baguette tastes good with it.