Preheat the oven to 200°C.
Layer a baking tray with foil or parchment paper.
Mix brown sugar and cinnamon in a plate.
Coat the slices of pineapples with the brown sugar mixture on both sides.
Arrange the pineapple rings in the prepared tray.
Roast them for 20-25 minutes, until light golden in colour.
Remove them from the oven. Allow them to cool a bit.
Leave two pineapple ring for topping. Cut them into chunks.
Puree the rest into a coarse texture without using any water. Best to use the food processor.