Ingredients
4 large, roundish sweet potatoes, cut into chunky chips
1 tsp olive oil
1 tsp chilli flakes, plus a pinch
400g pack extra-lean beef mince
1 onion, grated
1 tbsp grated Parmesan
1 tbsp tomato ketchup
4 small wholemeal buns, halved
1 Little Gem lettuce, leaves separated
1 beef tomato, sliced
1 red onion, sliced (optional)
4 pickles or gherkins, halved
Method
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Heat oven to 220C/200C fan/gas 7. Toss the chips with the oil, 1 tsp chilli flakes and some seasoning. Arrange in a single layer on a large baking tray and cook for about 30 mins, turning halfway through.
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Put the mince, remaining chilli flakes, onion, Parmesan, tomato ketchup and lots of black pepper in a large bowl and mix to combine. Shape into 4 burgers. Ten mins before the chips are ready, put the burgers on a baking tray and bake for 10 mins until cooked through.
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Top one half of the buns with the lettuce, tomato and onion. Add the burgers, then top with the roll tops. Serve with chips and pickles on the side.
