This extraordinary burger constructed from yellowfin tuna patty, butter lettuce, crispy fried onions, and spicy aioli is surprisingly rather light and pleasant on the palate. The patty has a firm texture with a mild taste of the sea that is counterbalanced with the infusion of minced vegetables within the closely packed flakes of yellowfin tuna. The butter lettuce provides a smooth, buttery and refreshing crisp, the onion rings gives a crunchy and sweet bite, and the spicy aioli delivers that much needed creamy and spicy punch to cut through the flavors and prevent the fish patty from getting too overwhelmingly heavy.