Wash the chicken fillets, dab dry and cut into strips. Wash tomatoes, dab dry and cut into slices. Drain the corn on a sieve. Clean, wash, drain and cut lettuce into strips.
Mix lettuce, tomatoes and corn. Peel and halve the onion and cut into strips. Peel garlic and press it through a garlic press. Mix yoghurt, garlic, lemon juice and zest.
Season to taste with salt and pepper. Heat the oil in a pan and fry the chicken in two portions. Finally, fry onion strips in hot frying fat, add meat again and season with gyros spice, oregano, pepper and possibly a little salt.
If necessary, bake flat bread briefly, cut into quarters and cut a pocket into the quarters. Fill flatbreads with salad mix, chicken gyros and some yoghurt sauce. Serve immediately garnished with mint.
Put the rest of the yoghurt sauce in a small bowl and drizzle with olive oil. Sprinkle with lemon julienne and add extra.