Start eggs beating in stand mixer or Bosch
on high speed. Beat for about 5 minutes, or until eggs double in volume. While eggs are beating, start melting chocolate and butter in a double boiler over medium heat. Stir often. Add melted ingredients to beaten eggs gradually, slowly folding in each addition with a large, flat spatula or spoon. Fold together only until melted chocolate is mixed with eggs. Don't over mix.