Preheat oven to 200°C.
In a bowl, mix together the beef mince, Worcestershire sauce, mustard, salt and pepper.
Divide mixture into four portions and gently form each into a patty. Heat an oven-proof frying pan, add oil and cook patties for 2 minutes on each side, then place pan in the oven for 10 minutes.
For the butternut chips: peel butter-nut and slice into thin rounds. Heat oil and fry chips until crispy. Season.
Top each bun with one burger patty, lettuce, tomato, onions and seasoning. Serve with butternut chips.
Text and image source: Fairlady
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