Chop the boiled ham, salami, farmer`s ham and onion into small pieces. Mix the ketchup and tomato paste together.
Cut the flatbread horizontally. Brush the 2 flat bread halves evenly with the ketchup and tomato mixture, then spread the garlic on top. Top with the boiled ham, salami, farmer`s ham and onion pieces and the tomato slices. Season with salt and pepper. Top with cheese. Finally dust with oregano.
Bake in an oven preheated to 150 degrees for 15-20 minutes.
Brush the finished pizza with the garlic sauce and then cut into portions.