Molasses, Old-FashionedMolasses, Old Fashioned Unsulphured molasses. What is the difference between Blackstrap and Barbados Old Fashioned Molasses? Blackstrap Molasses has had more of the sugar extracted from it, which makes it less sweet (more bitter) but contains a higher amount of iron. Barbados Old Fashioned Molasses on the other hand, hasnt had so much of the sugar removed so it is sweeter, but doesnt have the higher concentration of iron. Nutrition Facts Serving Size: