Spiced Sweet Potato Burgers

I've been wanting to make these for ages and finally got around to it. They are lovely and spicy and of course you can adjust the curry powder and chilli flakes to your liking. This was hot enough for me!

Spiced Sweet Potato Burgers (from Waitrose Magazine)
(Serves 4)

2 sweet potatoes, 550g, peeled and cubed
3 tbsp oil
1/2 red onion, finely chopped
2 tsp curry powder
1/2 tsp chilli flakes
400g can butter beans, drained and rinsed
1 tbsp mango chutney
3 tbsp chopped coriander

Preheat the oven to 200C. Toss the sweet potato and 2tbsp oil, season. Spread out on a lined baking tray and roast for about 30 mins until golden.

Heat the remaining oil in a frying pan and gently fry the onion for about 5 mins, add the spices and fry for 2 mins.

In a bowl mash the beans with a fork into a chunky puree. Mash in the cooked onion and sweet potato. Stir in the chutney and coriander; season. Shake 4 burgers out of teh mixture and then bake on a lined baking sheet for 25 mins until golden.

Serve in a roll with mango chutney, onion and lettuce.