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Heat oven to 220C/200C fan/gas 7, oil the sweet potatoes, then put them straight on the oven shelf and roast for 45 mins or until tender all the way through when pierced with a knife.
Meanwhile, mash the avocado with the lime juice in a small bowl, then stir in the chilli, tomatoes, coriander and onion.
Cut the potatoes in half and top with the beans and guacamole. Serve with the lime wedges for squeezing over.