What is the fine-grained topic of the following text: Here’s a great video of Daniel Boulud and Thomas Keller preparing a slow cooked leg of lamb, while also discussing the USA’s contribution to the Bocuse d’Or, long before Team USA’s win at the 2017 competition. Only return the topic.
Daniel Boulud and Thomas Keller preparing a slow cooked leg of lamb and discussing the USA's contribution to the Bocuse d’Or.