Preheat the oven 180 C (350 F).
Slice the meat thinly and then pound each slice with the flat meat tenderizer. The aim is to make the meat slice about 6 cm x 5 cm in size.
Mix the grated onion, oregano, red pepper flakes, olive oil, salt and black pepper in a large bowl. Stir in the meat slices and coat each piece with this mix and then cover the bowl and marinate overnight in the fridge.
Put 2 tablespoon of olive oil into saucepan and then add the tomato paste, salt and black pepper and combine them well. Add the water then bring the sauce to the boil. Simmer for 10 minutes.
Slice the pide bread or cube bread into 2 cm x 2 cm squares and place them into the oven tray and then warm them in the oven for 5 minutes.
Pour olive oil to the skillet and cook the marinated meat slices on high heat; for about 3 minutes each side. While the meats are cooking, add a big knob of butter to the skillet to make topping. Fry the butter until sizzling.
Place the warm square cut Pide Bread / Cube Bread pieces to the plates evenly.
After the meats cooked; place the meats on top of the warm Pide Bread / Cube Bread pieces evenly and then pour over the tomato sauce.
Right after you pour tomato sauce, pour the sizzling butter over the top of the tomato sauce.
Serve immediately with plain yogurt.