Add the tuna in a food processor and pulse to grind. Put the tuna in bowl and stir in the chives, tamari, garlic, and black pepper, to taste. Add the panko crumbs and sesame seeds to a shallow dish. Form the tuna mixture into 8 small patties and roll in the bread crumbs.
In a large skillet over medium-high heat, add the vegetable oil. Put the burgers in the pan and cook until lightly golden brown on the outside and pink in the middle, about 2 minutes per side.
Put the burgers on the bun bottoms. Top with lettuce and pickled ginger, then slather the bun tops with wasabi mustard. Cover with the bun tops and serve with fancy root vegetable chips.