In a bowl combine the yoghurt and flour until mostly mixed together.
Dust the bench lightly with the extra flour and tip mixture out onto bench.
Knead for about 5 minutes or until the dough comes together. It will start out quite crumbly with bits all over the bench, but as you knead it, pick those extra bits up and after about 5 minutes it will come together to form a smooth dough.
Break off small balls, ( a bit small than a golf ball) and roll out flat with a flour dusted rolling pin.
Place a dry fry pan (no oil) over med-high heat and shake off any excess flour, then place a bread into the fry pan. After about a minute it will start to bubble up just slightly, flip over and cook for about the same time on the other side.
Use a dry tea towel or cloth, to wipe out any flour from the fry pan between breads as this will start to burn.
Place the garlic, onion, cabbage and celery into a food processor and blitz until a fine paste.
Stir through the mince until well combined, I recommend doing this with a spin or your hand in a bowl, rather than in the processor. if done in the processor your mince will turn to sausage meat.
Make into small patties with your hands and place into a frypan over med-high heat, you may need a little oil if you have low fat mince.
Cook each pattie for 3-4 minutes on one side, then flip over and pace a slice of cheese on top. Cook for about the same time on the other side or until cooked through. To get a nice golden melt on your cheese, place under the grill for a minute of two.
Make each burger with two pieces of flatbread, a burger patties, avocado, lettuce and sauce. (or however you and your family like your burgers)
Serve with gherkins and carrots, or hand cut chips!