Mushroom and chesnut Burger

potato 28.0% , mushroom 26.0% , chestnut 15.0% , onion 8.0% , wheat flour 5.0% , sunflower oil 4.7% , coriander 3.8% , durum wheat semolina 2.8% , rice starch 2.4% , garlic 2.1% , salt 0.4% , mushroom powder 0.4% , lovage 0.4% , Acidity regulator 0.4% , yeast 0.3% , white pepper 0.3%