Ingredients

   
4 eggs
4 tbsp Kewpie mayonnaise
1 tsp honey
¼ tsp salt
⅛ tsp black pepper
8 slices white bread (shokupan ideal)
½ tbsp unsalted butter, room temperature
1 tsp karashi (Japanese mustard) or a small amount of Dijon

Steps

  1. Bring a pot of water to a boil. Lower eggs in with a spoon. Boil 10 minutes.

  2. Transfer eggs to cold water. Cool 5 minutes, peel, and pat completely dry with kitchen paper.

  3. Place eggs in a bowl. Add salt and pepper. Mash with a flat spatula — keep some egg white pieces for texture, let the yolks go creamy.

  4. Fold in mayonnaise and honey. Mix 2–3 minutes until sticky and cohesive.

  5. Trim crusts from bread (optional). Spread butter on one slice, karashi on the other.

  6. Spread egg filling on the buttered side, mounding slightly in the center.

  7. Close with the karashi slice. Cut in half or into fingers.

Notes

  • Kewpie mayo is essential — it’s richer and more emulsified than Western mayo because it uses only egg yolks.
  • The honey is the secret ingredient. Just a touch balances the richness without making it sweet.
  • Pat eggs completely dry after peeling. Excess water makes the filling watery instead of creamy.
  • Butter on the bread is a moisture barrier — don’t skip it if making ahead.
  • For cleaner cuts: wrap assembled sandwich in cling film, refrigerate 15–20 minutes, then cut with a serrated knife. Wipe blade between cuts.
  • The egg filling keeps 2–3 days in the fridge in a sealed container. Assemble sandwiches day-of.
  • Works as a standalone egg salad (skip the bread) — serve on rice, in onigiri, or as a side.
  • Shokupan (Japanese milk bread) is ideal but any soft, fine-crumbed white bread works.