This recipe was extorted, begged, and wheedled from a certain French
personage now dwelling in CA, who might or might not approve of my making
it even this public.  They are definately a labor of love but produce
legions of adoring fans wherever they appear.  The directions are,
admittedly, a little terse.  The basic idea is to combine eggs, grated
chocolate, and butter.  Apply heat while stirring constantly so as to make
a smooth mixture (without curdling the eggs).  Add flavorings and chill
until the mixture can be formed into balls.  Roll balls in cocoa powder. 
Consult a good cookbook for more details. 

It is important that the butter be unsalted, and fresh; it is also
important to use good quality chocolate.  Lindt is acceptable, Hershey's
just won't be as good.

2 eggs
1 tablespoon hot water
4 tablespoons instant coffee
4 tablespoons Kahlua
250 grams bittersweet chocolate
100 grams unsalted butter.
Cocoa powder

2 eggs
Zest from 4 oranges
4 tablespoons Grand Marnier
250 grams milk chocolate
100 grams unsalted butter.
Cocoa powder

Directions : you know what to do.