Signature at Corner House: Cevennes onion done 4 ways. First is an onion puree and confit, a 62°C sous-vide egg and black truffles. Then, onion tart. Followed by onion chip and onion tea. The onion tea is the most expensive of components as 3kgs of onions and two days work produce a mere 200ml. That probably explains the price for this dish 😰 But overall, 💯