Core the tomatoes, peel the cucumber as desired, cut in half lengthways and remove the watery seeds with a spoon. Cut both into cubes, chop the garlic cloves. Cut the feta cheese into cubes. Finely slice the red cabbage. Mix everything in a salad bowl with the doner kebab, coleslaw and tzatziki and season with pepper, salt, oregano and optionally a little chili.