Chocolate cherry black forest pavlova

4 egg whites

250g icing sugar

2 tsp cornflour

3 tbsp cocoa powder

1 tsp vanilla extract

1 tsp white wine vinegar

¼ tsp cream of tartar (or lemon juice will do)

Few drops of lemon juice (to clean your mixer and whisk)

For the filling: 

500ml whipped cream

1 tbsp icing sugar

2 tbsp kirsch or cherry liqueur (optional)

1 tin black cherries, pitted

100g chocolate shavings

200g Fresh cherries