For the colorful salad, first cut the cucumber into slices about 5 mm thick and then into small cubes. Slice and dice the tomatoes as well. Dice the feta cheese and finely chop the onion. Wash the corn and drain well. Mix all ingredients well and season strongly with oregano.
For the marinade, mix olive oil with a dash of vinegar and salt and pour over the salad. Stir the colorful salad well once again.