Euphemistically, called "tuna collar" in English, it's the jaw of the tuna (panga in Tagalog.)
So incredibly delicious you have no idea. Sushi lovers step up to the plate. This one was marinaded in garlic and ginger before being grilled on a lonely beach on a deserted island.
Eaten with calamansi, soy sauce and hot chilli peppers (not shown.)
The CC still dreams about it!