Japanese Egg Sandwich (Tamago Sando)
Japanese egg sandwiches live and die by the eggs: mashed with mayonnaise, a little sugar, salt, white pepper and milk, then tucked between buttered bread. Two servings, 10 minutes to prep, 12 to cook.
- Prep
- 10 min
- Cook
- 12 min
- Total
- 22 min
- Serves
- 2
Ingredients
What you’ll need — tap to tick off as you go
- 60 g
- 1 tsp
- ½ tsp
- 1 pinch
- 1 pinch
- 4 slices
- 10 g
Process
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Place the eggs in a single layer in a saucepan and cover with cold water by about 2 cm. Bring to a boil over medium-high heat, then reduce to a gentle simmer and cook for 9 minutes for firm whites and a custardy yolk.
While the eggs cook, prepare an ice bath. After 9 minutes, transfer the eggs immediately to the ice bath and let cool for 5 minutes. This stops cooking and makes peeling easier.
Peel the eggs under cool running water. Pat dry, then halve and separate the yolks from the whites.
In a bowl, mash the yolks with Japanese mayonnaise, soy sauce, sugar, salt, and white pepper (if using) until smooth and creamy.
Finely chop the egg whites and fold them into the yolk mixture. Taste and adjust seasoning.
If desired, lightly toast the milk bread slices. Spread one side of each slice with softened unsalted butter.
Divide the egg salad between two slices of bread, spreading it thickly. Top with the remaining bread slices, buttered side down.
Press gently, then cut each sandwich in half. For clean edges, wrap tightly in plastic wrap and let rest for 5 minutes before cutting.
Kitchen notes
Kitchen notes
- The most common mistake is overcooking the eggs: 9 minutes from boiling gives a creamy, slightly set yolk. If you prefer a firmer yolk, cook for 10 minutes, but no more or the salad becomes dry.
- Mash the yolks thoroughly before adding the whites; this ensures a smooth, uniform texture. Chopping the whites finely prevents the sandwich from falling apart.
- Chilling the egg salad for 15 minutes before assembling makes it easier to spread and improves flavor. Use soft, fresh milk bread for the classic pillowy texture.
Substitutions
- Japanese mayonnaise→regular mayonnaise with a pinch of sugar
- milk bread→brioche or soft white sandwich bread
- soy sauce→tamari for gluten-free option
- unsalted butter→olive oil or omit for dairy-free
Storage & reheating
Store the egg salad in an airtight container in the refrigerator for up to 2 days. Assembled sandwiches are best eaten fresh, but can be wrapped tightly in plastic wrap and refrigerated for up to 12 hours; let come to room temperature for 10 minutes before eating. Do not freeze.
FAQ
The questions we get asked most
Why is my Japanese egg sandwich watery?
Watery egg salad usually comes from undercooked eggs or not draining the cooked eggs properly. After boiling, cool the eggs in an ice bath and pat them completely dry before peeling. Also, mash the yolks well and avoid adding extra liquid like vinegar.
Can I make Japanese egg sandwich ahead of time?
Yes, you can make the egg salad up to 2 days in advance and store it in an airtight container in the fridge. Assemble the sandwiches just before serving for the best texture. If you must assemble ahead, wrap tightly and refrigerate for up to 12 hours.
How do I get a creamy yolk like in konbini sandwiches?
The key is precise cooking time: 9 minutes in gently boiling water yields a custardy yolk. Immediately transfer to an ice bath to stop cooking. Also, use Japanese mayonnaise, which is richer and tangier than American mayo, and mash the yolks thoroughly.
Can I use regular bread instead of milk bread?
Yes, but milk bread (shokupan) is ideal because it is soft, slightly sweet, and holds the filling without tearing. If using regular white bread, choose a soft, thick-cut variety and avoid toasting it too hard, as it can become crumbly.
Is Japanese egg sandwich gluten-free?
Not as written, because milk bread contains wheat and soy sauce contains wheat. To make it gluten-free, use gluten-free bread and tamari instead of soy sauce. Check that your mayonnaise is also gluten-free.
How long can I keep egg salad in the fridge?
Homemade egg salad keeps for up to 2 days in an airtight container in the refrigerator. After that, the texture may become watery and the risk of spoilage increases. Always discard if it smells off or has been left at room temperature for more than 2 hours.
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