In the top of a double boiler, off the heat, whisk together the eggs, sugar, ginger juice and ground ginger. Place over a pot of simmering water and whisk constantly for 6 to 8 minutes or until the sugar has completely dissolved and the mixture is thick and creamy. Remove from the heat and add the chocolate. Let sit for 2 minutes without stirring. Mix. If the chocolate has not completely melted, place back over the pot of simmering water to melt the chocolate but without heating the mixture too much. Remove from the heat and let sit for 10 minutes. The mixture will be the consistency of a smooth, thick ganache.