Beat egg yolks with the 3/4 cup sugar. Bring half-and-half and vanilla bean to
boil. Stir 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.
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.