Place all four squares of chocolate in a shallow, microwave-safe bowl with water. Microwave on high for two minutes. Meanwhile, add all remaining ingredients to the blender. Remove chocolate from microwave and immediately stir the chocolate with a fork to achieve a smooth paste. Add this to the blender with the other ingredients and blend until smooth, stopping to scrape down the sides of the blender with a plastic spatula when necessary. Immediately transfer the chocolate tofu mixture to pie plate and chill for at least six hours, but overnight is best. Serve cold.