Arrange the citrus slices over two baking trays lined with baking parchment so they’re in a single layer. Heat the oven to 110C/90C fan/gas 1/4. Bake for 2 hrs until firm and dry, turning the trays around halfway through. Check after 1 hr 15 mins, removing any orange slices that are drying out too quickly, then continue to cook the rest.

Leave to cool completely on the tray, then package with the garnishes of your choice.