Clean, wash and finely grate the cucumber and zucchini. Wash dill and lemon balm, shake dry and chop finely, except for 4 stems of lemon balm. Briefly puree the kefir, milk, yoghurt, cucumber, zucchini and ouzo in a mixer, season with salt and pepper. Crumble the cheese finely. Serve the soup in glasses with 1 stem of lemon balm. Sprinkle with cheese and chopped herbs. Olive bread tastes good with it