Preheat oven to 180C/350F. Bring a pan of salted water to the boil. Add the sweet potato chunks and bring back to a simmer. Cook for 10 minutes or so until tender. Drain and leave to cool slightly.
Place 1 can of chickpeas into the bowl of a food processor. Blitz until finely chopped. Add the sweet potato chunks and continue to blitz until smooth. Transfer to a bowl.
Add the remaining can of chickpeas to the food processor and pulse until roughly chopped. Add these to the bowl of sweet potatoes.
To the bowl of sweet potatoes and chickpeas, add the garlic, ginger, chilli, toasted sesame oil, gram flour and salt. Stir well to combine. At this point you can absolutely roll these out and bake them but I would recommend letting them chill out in the fridge for a while, as the mixture will be easier to work with.
Roll the mixture into small balls (roughly tablespoonfuls). Roll in toasted sesame seeds, if liked, and set on a baking sheet lined with baking parchment. Bake for 30 minutes until golden and firm to the touch. Serve with green tahini sauce, rocket, avocado and anything else you fancy!