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Put the spring onions and onion in a large bowl of iced water and soak for at least 5 mins (or up to 2 hrs) in the fridge, until the spring onions curl up.
When ready to serve, drain well, spin in a salad spinner or pat dry, then transfer to a medium bowl. Add the sesame oil, gochugaru and a pinch of salt, then toss to coat. Serve immediately.