Place the cherries, sugar and lemon juice in a saucepan over a medium heat
Simmer for 20 minutes then stir in the dissolved cornstarch
Cook until the sauce thickens, about 5 minutes
Set aside while you prep the pastry
Roll out until the sheet of pastry
Cut out 12 equal sized circles
Spread the cherries onto six of the pastry circles leaving about 1cm of space around the edge of the pastry, this stops the filling leaking everywhere when you bake the pastries
Place the remaining six circles of pastry on top of the filled slices
Cut a little steam hole in the middle of ech pastry
Serve dusted with a little icing sugar