small jug of really good quality drinking chocolate
sugar, to taste
Make up a small jug of really good-quality drinking chocolate (I use Charbonnel & Walker, which is quite expensive, but tastes fantastic). Make some strong espresso. Third-fill two glasses with the coffee, adding sugar to taste. Add another third of chocolate. Whisk some single cream until frothy, pour over the mocha so that it sits on the top. Drink and enjoy.