If you're foraging for wild chestnuts, don't confuse edible sweet chestnuts with unrelated (and inedible) horse chestnuts - also known as conkers. Wild British sweet chestnuts are not fully ripe ...

Cut the panettone into thick slices. Melt the chocolate in a bowl over a pan of gently simmering water. Mix the melted chocolate into the chestnut purée, add Mascarpone and beat in well.