Preheat oven to highest temperature (240°C). To a food processor, add the onion, parsley, and bell pepper. Pulse until finely chopped and transfer to a large bowl. Add the plant mince, tomato paste, olive oil and seasoning mixture to the bowl and mix well. Cut the dough into 4 pieces. Flour your work surface and roll each piece of dough into a circle as thin as possible, then transfer onto a lined baking tray