Blend the mayonnaise, soy sauce, wasabi, ginger, and lime juice in a food processor until smooth.
Sprinkle the tuna with salt and pepper, heat a little oil in a sauté pan, and then add the tuna steaks and sear to rare. (You can also use a grill pan on the stovetop instead.)
Slice each tuna steak into 7 thin strips and set aside. Set the rolls on four plates, spread 1 ounce of the wasabi aioli on the top of each bun, and place some tuna slices on the button of each bun. Then top with daikon sprouts, a slice of tomato, some avocado slices, and the top bun. Then take a bite!