Tasty Kitchen is one of the largest sites using BuddyPress. They have created a beautiful custom BuddyPress food blogging theme that powers their huge community. It's a great example of using BuddyPress for cooking and recipe sharing.
Tasty Kitchen is a culinary community created in conjunction with Food Network’s The Pioneer Woman. Tasty Kitchen users can submit recipes, review and rate other members’ recipes, send messages, and interact.