Place ⅓ of the cherries with the liquid and sugar in a saucepan.
Take 3 tablespoon of the liquid and mix it with the cornstarch to form a smooth pastel
Now heat up the cherries at a medium heat to boil. Stir in the cornstarch / cornflour paste and boil for 2 minutes. The cherry sauce should start to thicken.
Now add in the remaining cherries and heat up for a further minutes.