Chocolate parfait with coffee prunes and sugary walnuts

I’ve served this parfait so many times and every time someone asks for the recipe. Let’s face it, what’s not to love about a rich chocolate ice cream that needs no churning and can be made in advance. This is a winter version, served with slightly alcoholic prunes and walnuts, but you could serve it with fresh berries, candied cumquats, raspberry sauce or almond praline.