Preheat the oven to 180°C/Fan 160°C/Gas 4.
Wash the kale and dry well: it will crisp up better if it is very dry. Tear the leaves into bite-sized pieces and place on a baking tray (or two if you’re making a lot – you don’t want to crowd the tray/s).
Trickle over the oil and massage it thoroughly into every nook and cranny of the leaves. Don’t salt them yet – they roast better just with the oil. Spread the leaves out on the tray/s in an even, single layer.
Bake for 10 minutes, then take the tray from the oven and give the leaves a good stir. Return to the oven and bake for a further 5–10 minutes.
The leaves should be crisp but don’t let them get too dark or they will be bitter.
Sprinkle with flaky sea salt and serve.
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