Shake Shack Collaborates With Chef Fergus Henderson on an Eel Burger

Shake Shack has had a fair share of collaborations with big name chefs and another upcoming special poised to join the list. Created alongside British Chef Fergus Henderson is a smoked-eel burger garnished with smoked Niman Ranch bacon, pickled red onion, crème fraîche, fresh horseradish and watercress, all for $10 USD. The exotic sandwich will only be available for two days on September 15 & 16. In addition, Shake Shack will serve the chef's St. John restaurant's signature vanilla-custard dou...