Rostifyllda lökar

👩‍🍳 Gör så här

1. 1
   Heat oven to 200C/fan 180C/gas 6. Place the onions on a baking tray, brush with olive oil, season, then cook for about 1 hr until golden and tender.
2. 2
   Meanwhile, mix the potato and carrot together, then stir in the mustard and seasoning. Divide the mixture between the onions, then dot the top of each one with a little butter.
3. 3
   Return the onions to the oven and cook for 15 mins until they are meltingly tender. Sprinkle with the cheese, then cook for a further 5 mins until the topping is golden and bubbling.