Combine ingredients for the spicy sauce, mixing together until incorporated. Set aside.
Assemble bowls. Place 1 cup rice in the bottom of a large bowl and top with red leaf lettuce, carrots, cucumber, radish sprouts, salmon, tuna, and masago. Garnish with sesame seeds, green onions, and bonito flakes. Drizzle sesame oil on top and add as much spicy sauce as you would like. Mix well and enjoy.
Notes
This recipe includes 4 ounces of seafood per serving but you can adjust accordingly.Serve gochujang sauce on the side, allowing diners to make their hwe dub bap as spicy as they would like.