Vegetarian recipe ideas
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Heat the oven to 200C/fan 180C/gas 6. Prick the sweet potatoes all over with a fork and put on a large baking tray. Rub each with a tiny bit of olive oil and season, then bake for 40-45 minutes until tender.
Meanwhile, melt the butter in a small pan then gently cook the rosemary, garlic and most of the chilli for 5 minutes.
Split the sweet potatoes and scoop out most of the flesh, leaving a shell. Mash the flesh with the butter mix, season then stir in 3⁄4 of the gruyère. Pile back into the skins then sprinkle over the rest of the cheeses and chilli. Bake for 10 15 minutes or until melted and piping hot.