Season the tuna loin with the gochugaru, salt, and pepper.
Preheat a cast iron skillet or your gas griddle over high heat. Place the oil down on the cooking surface.
Sear the tuna for 10 seconds on each side.
Remove, cover, and chill for an hour.
Toss the edamame in the oil, gochugaru, sesame seeds, salt, and garlic. Sauté for 30-60 seconds.
Slice the tuna into 1/4" thick slices and serve over the sushi rice with the spicy edamame. Sprinkle with the green onions, chives, and sesame seeds, and drizzle with sriracha and Bachan's.