Method Heat the oil in a frying pan and fry the onion for about 5 mins or until soft. Leave to cool slightly. When cool, put the onion in a large bowl with the mince, egg, bashed crackers, chilli, garlic, ketchup and brown sauce, and mix well to combine. Divide the mince into 6, roll into balls and flatten each into a nice fat burger.
Put the flour on a plate, dab each burger to the flour on both sides, then transfer to a baking tray. Wrap with cling film and pop in the fridge for a couple of hours.
Heat oven to 200C/180C fan/gas 6. To make the wedges, put the sweet potato on a baking tray and drizzle with olive oil. Sprinkle with paprika, season, then give them a good shake or shuffle around with your hands to make sure they’re well coated. Roast for 30-40 mins depending on how crisp you like them. Make sure you give them a good shake a couple of times to ensure they cook evenly.