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완성된 Sung Si-kyung's Secret Japanese Convenience Store Style Egg Sandwich Recipe - 달걀 7개로 만드는 일본 편의점 스타일 에그 샌드위치로

Sung Si-kyung's Secret Japanese Convenience Store Style Egg

📺 YouTube⏱ 약 8분✍️ Editor Reviewed
✍️ I Love Recipe Editorial Team··Updated: Jun 25, 2026

This Japanese convenience store style egg sandwich, made with 7 eggs, separates the yolks and whites to capture both flavor and texture, resulting in a moist sandwich.

📝 Editor's Notes

Sung Si-kyung's Egg Sandwich is a special, medium-low difficulty dish that can be completed in about 30 minutes using 7 eggs.

Thanks to the method of separating the yolks and whites, you can simultaneously enjoy the moist and creamy yolk paste and the delightful texture of the chopped whites, just like Japanese convenience store style egg sandwiches.

It's satisfying yet easy to enjoy, making it perfect for a weekend brunch or a picnic lunch.

It will be an even more satisfying meal when served with a plain coffee or a fragrant tea.

🛒 Ingredient Tips

The key ingredient for this egg sandwich is, of course, the eggs.

Fresh eggs typically have rough, clean shells, and their contents should not slosh when shaken.

Using refrigerated eggs reduces the risk of cracking when boiling.

For the mayonnaise, both regular and truffle mayonnaise are used; the truffle mayonnaise adds a luxurious flavor, so be sure to include it if possible.

Using moist and soft milk bread works wonderfully with the egg filling, enhancing the overall deliciousness.

🔄 Substitution Guide

If you don't have truffle mayonnaise, using only regular mayonnaise is perfectly fine.

While it won't have the unique truffle aroma, the inherent richness of the eggs will still make it delicious.

Instead of yellow mustard, you can use whole-grain mustard or Dijon mustard.

Each type of mustard offers a different aroma and taste, so choose according to your preference.

Adding a little heavy cream instead of milk can create a richer and creamier flavor, but keep in mind that it will increase the calorie count.

🥘 Ingredients

Eggs
7large
Salt
a pinch
Black pepper
to taste
Sugar
0.5tbsp
Milk
as needed
Mayonnaise
a little
Truffle Mayonnaise
as desired
Bread
2slices
Yellow Mustard
as needed
Plastic wrap
as needed

👨‍🍳 Cooking Points

The most crucial cooking points for this recipe are how to boil the eggs and how to make the yolk paste.

First, place the eggs in water before it boils and cook for 8-9 minutes to achieve a perfectly soft-boiled state.

This ensures the yolks are moist and can be made into a smooth paste.

Second, when mashing the yolks, it's important to add salt, sugar, black pepper, and milk, mashing and mixing until it reaches a smooth, not-too-thick custard-like consistency.

Adjust the amount of milk gradually to achieve your desired texture.

Finally, roughly chop the egg whites to preserve their texture, as this is a key charm of this sandwich; be careful not to chop them too finely.

👨‍🍳 Directions

1

Place 7 eggs into water before it boils and cook for 8-9 minutes to achieve a perfectly soft-boiled consistency.

2

Separate the yolks and whites of the cooked eggs, placing only the yolks in a bowl.

3

To the bowl with the yolks, add a pinch of salt, 0.5 tbsp sugar, black pepper to taste, and milk as needed. Mash and mix until it reaches a smooth, not-too-thick custard-like consistency.

4

Add a little mayonnaise and truffle mayonnaise as desired to the yolk mixture, and mix well.

5

Roughly chop the separated egg whites to preserve their texture.

6

Add the chopped egg whites to the yolk mixture and mix well to complete the egg filling.

7

Lay plastic wrap on a cutting board for assembling the sandwich, then place 2 slices of bread on top.

8

Spread yellow mustard evenly on one slice of bread.

9

Generously spoon the egg filling onto the bread slice with mustard.

10

Cover the filling with the remaining slice of bread, then tightly wrap the entire sandwich with plastic wrap to prevent the filling from spilling out.

💡 Tips

When boiling eggs, add them before the water boils to prevent cracking.

Separating the yolks and whites, then seasoning and mashing the yolks into a paste first, helps enhance both flavor and texture.

It's recommended to season the yolk mixture a bit stronger, considering it will be mixed with the whites. The bread and mayonnaise will help balance the seasoning.

This sandwich is even more delicious than convenience store egg sandwiches, so be sure to try making it!

📦 Storage & Reuse

Store the finished egg sandwich tightly wrapped in plastic wrap in the refrigerator, and consume it within 1 day for the freshest and best taste.

Since the filling contains eggs, it's difficult to store for an extended period.

Any leftover egg filling can be stored in an airtight container in the refrigerator and enjoyed the next day as an open-faced sandwich on toast or crackers.

To reheat, microwave for 10-20 seconds, just enough to remove the chill, which helps maintain its moist texture.

🥢 Who This Is For

This sandwich is great as a snack for children and an excellent alternative for a busy breakfast.

Especially when you want to enjoy a leisurely brunch on the weekend, it makes a perfect meal when served with warm coffee or orange juice.

It's also ideal for a picnic or a simple packed lunch.

You can create an even richer dining experience by serving it with a fresh fruit salad or a light soup.

🔥 Nutrition Info

This egg sandwich uses 7 eggs, so dividing it into a single serving (based on 2 slices of bread) is estimated to be approximately 500-600 kcal.

It is expected to contain about 25-30g of protein, 35-40g of fat, and 30-35g of carbohydrates.

Eggs are a complete protein source, containing all essential amino acids, and are rich in various vitamins and minerals such as Vitamin D, Vitamin B12, and selenium.

Due to the mayonnaise and bread, the carbohydrate and fat content is relatively high, so it is advisable to moderate your intake.

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