It's a Blue Fin Tuna steak from a 200-pounder swimming off the coast of Mexico, packaged and presented with others by Hai Dang, intrepid rod-man of great renown. Stan enjoyed this cut (Hai doesn't eat fish, he provides them), and there's leftovers for tuna salad, tuna sandwiches, etc. Packed with Omega-3, vitamins, protein, it is said to be the healthiest fish available. If Stan lives to 100, this will be the reason.
