Combine the blueberries, sugar, cinnamon stick, strips of orange and lemon zests, lemon juice and 2 tablespoons water in a saucepan over low heat. Cover and cook, stirring occasionally, for 2–3 minutes, or until the sugar has dissolved.
Bring to a simmer and cook for 5 minutes, or until the blueberries are soft and the sauce has thickened slightly