Heat 1 tbsp oil in a shallow saucepan over a medium flame. Tip in vegetables, seasoning and soy sauce, then cook, stirring
occasionally, for 10 mins until soft. Tip veg into a food processor with the beans, cheese and bread, season, then pulse to a thick paste.
With wet hands, mould mix into 8 burgers. These can be kept in the fridge for 2 days or frozen, stacked between greaseproof sheets for up to 2 months.
To cook, heat oil in a frying pan and fry 2-3 mins on each side until crispy. Serve with toasted buns, salad, ketchup and mayo.