Boil the sweet potatoes until cooked (about 15 minutes). Drain, and leave to dry.
Place the sweet potato chunks, soy sauce, flour, spring onions, chilli in a mixing bowl. Season, and mix together with your hands until smooth.
Melt a knob of butter in a large frying pan. Use a table spoon to scoop out some of the sweet potato mix and place in the frying pan, flattening with the back of the spoon to create a burger shape.
Fry on a medium heat for about 5 minutes on each side, until cooked.
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Notes
Add a healthy twist to the traditional burger by serving it with spinach leaves and natural yoghurt