Peel the papino and cut it in half. Slice a small section away on the rounded side so that it forms a base on which the fruit can “stand”. Place the half on a serving dish and fill the cavity with the berries and a generous dollop of custard!!
Add the sugar and cornstarch to a mixing bowl and stir to mix. Whisk the egg yolks and 50ml milk together and stir into the sugar mixture to make a smooth, runny paste. Set aside. Add the 700ml milk to a saucepan set over medium-high heat and bring to a boil. Take the saucepan from the heat and drizzle a thin stream of milk on to the egg mixture while whisking vigorously. Pour the mixture back into the saucepan, place it over medium-high heat and whisk until thick. Remove from the heat and stir in the vanilla and cinnamon. Add the oats to a bowl/glass jar. Pour the warm mixture over the oats and leave to cool. Refrigerate overnight. Dust with cinnamon-sugar to serve.
The oats may be kept in the refrigerator for 5 days.