Cut the flatbread flat. Mix the sauce or ketchup with the pizza seasoning, onions and garlic and distribute evenly on both halves of the bread. Drain the tuna, pick it up and distribute it as well. Scatter cheese over both halves
Bake in a hot oven at 200 ° C top / bottom heat for 10 to 20 minutes, depending on your taste.
Of course, the covering can be exchanged as desired.