Shake the yeast with salt in a small, tightly sealable can until the yeast has liquefied. Put the flour in a large bowl with the liquefied yeast, milk and oil. Close the bowl tightly, prepare the dough by circles and shaking, then work with a spatula. Let the yeast dough rise in the heat.
Roll out the dough in a large, square shape. Place the zucchini slices on top, sprinkle with garlic, salt and pepper. Mix tomatoes with mozzarella and rocket in a bowl and spread over the zucchini.
Roll up the dough like a strudel, cut into approx. 2 cm thick slices and place them next to each other on a baking sheet lined with baking paper. Bake in the oven at 200 ° C for about 15 minutes until crispy.