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Japanese-Style Tuna Sandwich

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  • Author: Asma
  • Prep Time: 10 minutes
  • Total Time: 10 minutes
  • Yield: 2 sandwiches 1x
  • Category: Lunch, Sandwiches, Japanese Cuisine
  • Method: No-Cook
  • Cuisine: Japanese

Description

This Japanese-Style Tuna Sandwich (Tuna Sando) is creamy, savory, and incredibly soft, made with fluffy Japanese milk bread (shokupan), a rich tuna-mayo filling, and a touch of umami from soy sauce or dashi. Inspired by Japanese convenience store sandwiches, this simple yet delicious sandwich is perfect for a quick lunch or snack!


Ingredients

Units Scale

For the Tuna Filling:

  • 1 (5 oz) can tuna, drained
  • 2 tbsp Japanese mayonnaise (Kewpie)
  • 1 tsp soy sauce (or 1/2 tsp dashi powder for umami)
  • 1/2 tsp Dijon mustard (optional)
  • 1/4 tsp salt (adjust to taste)
  • 1/4 tsp black pepper
  • 1/2 tsp lemon juice

For the Sandwich:

  • 4 slices Japanese milk bread (Shokupan) or soft white bread
  • 1 tbsp unsalted butter, softened (optional, for extra richness)
  • 1/2 cup shredded lettuce (optional)

Instructions

  1. Prepare the tuna filling – In a bowl, mix tuna, Kewpie mayo, soy sauce (or dashi), Dijon mustard, salt, black pepper, and lemon juice until smooth.

  2. Prepare the bread – Lightly butter one side of each bread slice for extra richness.

  3. Assemble the sandwich – Spread the tuna mixture evenly onto two slices of bread. Add shredded lettuce, if using.

  4. Seal and trim – Place the remaining bread slices on top. Gently press down, then cut off the crusts for an authentic Japanese sandwich shop look (optional).

  5. Serve and enjoy – Cut diagonally into triangles and serve immediately, or wrap in plastic and chill for 15 minutes for the best texture.


Notes

  • Kewpie mayo gives the best umami-rich, creamy flavor—regular mayo works too but won’t be as rich.
  • Swap soy sauce for miso paste for a deeper umami taste.
  • For a richer version, toast the bread lightly before assembling.
  • Pairs perfectly with miso soup or green tea for a classic Japanese meal!