In 4 small dessert bowls or glasses, layer the rice pudding, apple sauce and blackberries, finishing with a few blackberries on top. Scatter with the brown sugar and leave in the fridge for 10 mins until the sugar has melted. You can also make up to 2 hrs ahead and keep covered in the fridge.
Make it hot
Layer rice, apple sauce and berries in microwave-proof glasses. Cook on High for a couple of mins, then serve with extra berries and sugar on top.