Put the eggs, egg yolks, and sugar in a large bowl and beat with an electric hand-held mixer until the mixture is pale yellow, 10 to 15 minutes.
Put the chocolate and butter in the top of a double boiler set over simmering, but not boiling, water (do not let the bottom of the pan touch the water). Melt gently, stirring frequently, until smooth. Remove the top pan from the heat. Add a sm