Ingredients
- 4 large onions
- sliced into quarters
- keeping root intact
- 2 tablespoons olive oil
- 2 large potatoes
- grated
- 3 tablespoons coarse grain mustard
- 25 g butter
- 75 g vegetarian gruyere cheese
- grated
Instructions
- Heat oven to 200C
- Place the onions on a baking tray, brush with olive oil, season, then cook for about 1 hr until golden and tender.
- 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.
- Return the onions to the oven and cook for 15 mins until they are tender.
- Sprinkle with the cheese, then cook for a further 5 mins until the topping is golden and bubbling.
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