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Microwave the sweet potato on High for 6 mins until tender. Lightly mash the beans, then add the potatoes, 2 spring onions, coriander, chipotle paste and seasoning. Mash a little more until the potato is combined. Shape into 4 cakes.
Heat the oil in a non-stick frying pan, then fry the bean cakes for 4-5 mins each side.
Meanwhile, mix the mayo, lime juice and seasoning in a bowl. Add remaining onion and salad ingredients and toss well. Serve alongside the bean cakes.