Preheat the oven to 200 ˚C. Spread the chips over a baking tray covered with baking paper, and sprinkle with salt if necessary. Bake for about 25 minutes until golden brown.
Heat the oil in a non-stick frying pan, and fry the shawarma for 6 minutes until golden brown. Spread the shawarma over the fries. Sprinkle with the cheese, and place in the oven for about 10 minutes until the cheese has melted.
Cut the onion into thin rings, the tomato into 1-cm cubes and the cucumbers into half slices. Remove the dish from the oven and cover with the lettuce, cucumber, diced tomatoes and red onion. Drizzle with the vegan garlic sauce.