Mix a marinade from oil, vinegar, mustard, salt, pepper and caraway seeds.
Cut the tomatoes into small cubes, add to the marinade and mix well. Possibly add a little more cucumber water. Cut the spring onions into rings and mix with the tomatoes. Cut the cucumber into slices or cubes and mix in as well.
Now cut the Harz cheese into approx. 1 - 1.5 cm large cubes and distribute well (otherwise it will stick together). Mix well with the other salad ingredients and let everything stand for about 1 hour.