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Rengoku's Bento: Inspired by Demon Slayer

Inspired by Demon Slayer, I’m making Rengoku’s iconic bento. This was a long time coming but with Mugen Train airing now, I thought it was the perfect time. This scene is so silly and is an amazing introduction to a fantastic character. This bento is truly comfort food in a box. Gyudon (fresh rice, topped with juicy beef and onions) makes for a bite that will be sure to make you shout “UMAI!”
Total Time 30 mins
Course Bento, Dinner, Lunch
Cuisine Japanese
Servings 4


  • 3 cups uncooked Japanese short grain rice
  • 4 green onions or 1 negi, stems cut into 2 inch slices
  • 2 eggs medium boiled (1 half egg per serving)
  • ½ a block of firm or extra firm tofu cut into small rectangles (8 pieces)
  • neutral flavoured oil
  • 1 yellow onion halved and sliced thinly
  • 1 cup water
  • 1 tsp instant Dashi Powder
  • 4 Tbsp soy sauce gluten free
  • 2 Tbsp mirin
  • 2 Tbsp sake/chinese cooking wine
  • 1 Tbsp granulated sugar
  • 1 inch knob ginger julienned (matchsticks)
  • 1 lb thinly sliced beef
  • beni shoga or normal pickled ginger


  • Wash your rice! Rinse rice multiple times until the water comes through clear. Cook your rice using whichever method you prefer. I use my new rice cooker that I am in love with!
  • Medium boil the eggs. Bring a small pot of water to a boil and gently lower the eggs in. Let cook for 8 minutes then place eggs into an ice water bath for at least 5 minutes to allow for easy peeling. Slice eggs in half and reserve 1 half per serving.
  • Cut the onion in half and then thinly slice. Slice the green onion and set both aside.
  • Cut the tofu. Laying down, cut down the middle (flat, then in 4 cuts across lengthwise)
  • Heat a large, lightly greased, frying pan over medium heat (you can use a bit of oil or some cooking spray). Brown both sides of the tofu and green onions.
  • Once seared, add the water, dashi powder, soy sauce, mirin, sake, and sugar to the pan. Mix to help the sugar dissolve, cover and let come to a boil.
  • When boiling, add the sliced onions, cover and cook until soft. Don't forget to cover the pan here otherwise your sauce will evaporate!
  • Remove the tofu and green onions and set aside.
  • Add in the beef and sliced ginger and cook until it is no longer pink. If there is fat accumulating on the top (depending on your meat), skim it off.
  • To assemble the bento; spread the rice across the bottom of the box. In ⅓ of the bento, palace a pile of pickled ginger, followed by 2 pieces of tofu, 2 green onions and half an egg. Cover the remaining ⅔ of the bento with the meat and onions. Top with some extra sauce.
  • Serve and enjoy. Don't forget to yell “UMAI” (delicious) with each bite!
Keyword Anime, Bento, Comfort Food, Easy, Geek With Me