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Preheat the oven to 180°C/350°F/Gas 4.
Put the kale into a large bowl. Add the lemon juice, olive oil, cayenne, salt and pepper and use your hands to massage the seasonings into the leaves. Lay them flat on a baking sheet and bake in the oven for 10–15 minutes, turning halfway through, until crisp and lightly browned.
Sprinkle the lemon zest over the crisps before serving.