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Tip the potatoes into a large pan of cold salted water. Bring to the boil, then reduce the heat and simmer for 15-18 mins until tender. Drain and leave to cool completely.
Whisk the mayonnaise with the soured cream, sriracha, lime zest and juice, the honey, half the spring onions, most of the coriander and some seasoning.
Toss the cooled potatoes with the sriracha-mayonnaise mixture until all the potatoes are coated. Tip into a serving bowl and scatter over the remaining spring onions, the rest of the coriander and chilli flakes, if you like.