Place the pineapple, water (or fruit juice), cinnamon and star anise in a saucepan over a medium heat. Stew for 12-15 minutes, stirring regularly, until the pineapple has softened and most of the liquid has reduced.
Take the pot off the heat. Remove the star anise and transfer the pineapple to a bowl. Set aside to cool, then pop into the fridge until needed.
The oats can be served straight from the fridge or warmed up if you prefer.
Use certified gluten free oats if you are following a strict gluten free diet.
Replace the honey with maple syrup or brown rice syrup for a vegan version.