Cranberry and orange sparkler

In a saucepan, cover the cranberries with water and add the sugar. Cook for 15 mins, then drain and refresh in cold water. Transfer to a large jug. Juice the oranges into the jug and add the honey. Using a hand blender, combine the fruit and blend until smooth. Add the sparkling water to the jug and stir. Add ice just before serving and pour into four glasses. Make a small incision in each of the orange slices and fix onto the glasses to decorate.