Chocolate is signed by making your dominant hand into a C-shape. Take your non-dominant hand and lay it flat with palm down in front of your body. Take the C-shape and move it in a circle, with the side of your thumb circling on top of the palm of your non-dominant hand. You can remember the sign, because it looks like you are stirring a pot of gooey melted chocolate (and 'C' stands for 'chocolate').
Signs for treats like chocolate and candy are highly motivating signs and are usually learned quickly. However, they can result in lots of unwanted requests for these treats. To turn down a request, we find it best to acknowledge the sign by saying, "You want chocolate," but then firmly deny the request, "But we can't have chocolate today."
Such a delight to let our babies discover new flavors. Chocolate is best introduced contextually. Consider making healthy choices such as dark chocolate or low-fat chocolate milk.