Place the rhubarb, apples, sugar and Belvoir rhubarb & apple pressé in a large saucepan. Bring to the boil, then turn the heat down, cover and allow to cool down for 15 minutes (try not to stir too much as this will break up the fruit).
Meanwhile, make the crumble: place the flour and sugar in a bowl, then add in the cold butter. Using just the tips of your fingers, rub the chunks of butter into the flour/sugar mixture until it resembles breadcrumbs, then stir in the porridge oats.
Spoon the fruit into the bottom of a pie dish then top with the crumble. Sprinkle with the flaked almonds and bake for about 30 minutes. Serve with double cream or custard. Don’t forget to save some for breakfast too!