Beat egg yolks with the 3/4 cup sugar. Bring Half-and-Half and vanilla bean to boil. Stir a small amount of Half-and-Half mixture into egg yolk mixture, then return to remaining Half-and-Half mixture, stirring well to blend.
Stir in whipping cream. Strain.
Shave chocolate (or use chocolate chips) and place in 13 x 9 inch baking dish. Fill with cream mixture. Place dish in large pan filled half full of hot water.
Bake in water bath at 325 degrees F for 60 minutes.
Coat surface evenly with sugar and broil until sugar caramelizes.