Chocolate Rolled Fondant

In a 2-cup heatproof glass measure or bowl, sprinkle the gelatin over the water and allow it to sit for 5 minutes (if longer, cover tightly with plastic wrap). Set in a small pan of simmering water and stir until the gelatin is dissolved. (This can also be done in a few seconds in a microwave on high power, stirring once or twice.) Stir in the corn syrup and glycerin, then add the shortening an