An irresistible vegetarian mushroom burger filled with melty mozzarella and slathered in homemade tomato relish. This is designed to be a low cost recipe. Preheat the oven to 180C/160C Fan/Gas 4.

These tasty burgers are perfect as an easy mid-week meal, or for a barbecue. In fact, the tomato relish goes well with any grilled meat, from steaks and chops to bangers. For the burgers ...