Wash the tomatoes, drain and cut in half. Season the tomatoes with salt and pepper and mix into the coleslaw. Wash mint and lemon and dab dry. Cut the mint into fine strips, except for something to garnish.
Grate half of the lemon peel and stir into the yoghurt with the mint strips. Peel the rest of the peel with a julienne chiseler in fine strips and put aside for sprinkling. Squeeze the lemon and season the yoghurt with salt, pepper and 2-3 tablespoons of lemon juice.
Sprinkle with lemon julienne and mint and garnish. Peel onion and garlic. Quarter onion and cut into strips. Press garlic through a garlic press. Heat the oil in a large frying pan.
Chop into large pieces and crumble into the pan. Fry until crispy, turning over. Finally, sprinkle with thyme, add onions and garlic and also fry. Flavour the finished gyros with the gyros spice flavour salt.
Arrange on plates with coleslaw and serve with yoghurt dip. Flatbread tastes good with it.