Mix the Flour, corn starch and icing sugar.
Cut the butter in small pieces and add to the flour mixture. Mix it all together so it feels like you have sand between your fingers.
Add the almond flour and the egg and mix quickly together. Place it in the fridge for minimum 2 hours.
Take out the dough and roll it out so it is big enough to cover a pie form.
Place the dough in pie form, make sure it covers the edges.
Preheat the oven at 200 degrees Celsius and cook the pie bottom for 10 minutes. Take out the pie bottom.
Cut the plums in half and take away the core. Place the plums on the pie bottom.
Sprinkle the almond flakes and sugar over the tarte.
Lower the heat of the oven to 180 degrees Celsius and cook the tarte for 30 minutes. Take it out and let it cool down.