Freeze the two lindt chocolates for a couple of hours
Preheat the oven to 190ºc fan
Brush a little melted butter into the moulds and coat in a dusting of cocoa powder
Add the dark chocolate and butter to a bowl and melt together and leave to cool for 5 minutes
Add the egg and egg yolks and mix together
Add the sugar, and flour, and mix again
Pour into the two moulds and press the frozen lindt ball into the middle
Bake for 15–17 minutes
Cool for 10 minutes, and then turn out onto your serving plates
