Preheat oven to 120 degrees. Line an oven tray with baking paper. Use an electric mixer to beat egg whites in a clean, dry bowl until soft peaks form. add the sugar 1 tablespoon at a time, beating well between each addition. Continue beating until sugar dissolves and mixture is thick and glossy. Add the cornflur and half the orange blossom water and use a metal spoon to fold until just combined.