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Heat the oven to 200C/180C fan/ gas 6. Toss the sweet potato and roughly chopped onions with the oil, cornflour, and some salt and pepper to coat. Spread out on a baking tray. Roast for 35-40 mins until golden, tossing halfway.
To make the glaze, heat the oil in a large frying pan and fry the garlic for 1 min over a low heat. Stir in the remaining ingredients and bubble for 1 min. Tip the roasted potatoes and onions into the pan and toss to coat. Pile onto a platter and scatter with the finely chopped onions and chopped coriander.