This Korean egg salad sandwich (also called gyeran mayonez or gyeran sandwich) is a beloved street food and café staple in South Korea. It takes the classic creamy egg salad and adds a distinctly Korean twist: a touch of sweet onion, a hint of rice vinegar, and sometimes a slice of ham or cheese, all tucked into soft, fluffy milk bread. The result is a comforting, slightly sweet, and savory sandwich that’s perfect for breakfast, lunch, or a picnic.
Ingredients
- 8 large eggs
- 1/2 cup (120 g) mayonnaise (Korean mayonnaise like Kewpie is ideal, but any full-fat mayo works)
- 1/4 cup (40 g) sweet onion, finely minced
- 1 tablespoon (15 ml) rice vinegar (or apple cider vinegar)
- 1 teaspoon (5 g) sugar
- 1/2 teaspoon (2.5 g) salt, plus more to taste
- 1/4 teaspoon (1 g) freshly ground black pepper
- 1 tablespoon (15 g) unsalted butter, softened
- 8 slices of soft white bread (like milk bread, brioche, or shokupan)
- 4 slices of ham (optional)
- 4 slices of American cheese or cheddar (optional)
Instructions
- Place the eggs in a medium saucepan and cover with cold water by about 1 inch (2.5 cm). Bring to a rolling boil over high heat, then turn off the heat, cover the pan, and let the eggs sit for 10 minutes. Drain and transfer the eggs to an ice bath (a bowl of ice and cold water) for 5 minutes to stop cooking.
- Peel the eggs and place them in a medium bowl. Use a fork or a potato masher to roughly chop them—you want some small chunks for texture, not a paste.
- Add the minced onion, mayonnaise, rice vinegar, sugar, salt, and pepper to the eggs. Stir gently until well combined. Taste and adjust salt or vinegar if needed. The mixture should be creamy but not overly wet.
- Spread a very thin layer of softened butter on one side of each slice of bread. This creates a barrier that prevents the egg salad from making the bread soggy.
- If using ham and cheese, place one slice of ham and one slice of cheese on the unbuttered side of four slices of bread.
- Divide the egg salad evenly among those four slices, spreading it over the ham/cheese. Top with the remaining four slices of bread, buttered side down.
- Heat a large nonstick skillet or griddle over medium-low heat. Place the sandwiches (in batches if needed) onto the skillet and cook for 2–3 minutes per side, until the bread is golden brown and the cheese is melted. Press gently with a spatula if you like a flatter, more compact sandwich.
- Remove from the skillet, slice in half diagonally, and serve warm or at room temperature.
Tips
- Use soft bread: Korean egg salad sandwiches are made with pillowy, slightly sweet milk bread. If you can’t find it, brioche or even a good-quality white sandwich bread works. Avoid crusty sourdough—it overpowers the delicate filling.
- Don’t overmix: Keep some egg chunks for a nicer texture. Overmixing turns the salad into a gluey paste.
- Adjust the sweetness: Korean-style egg salad is slightly sweet. If you prefer less sweetness, reduce the sugar to 1/2 teaspoon or omit it entirely. You can also add a pinch of MSG (like Ajinomoto) for extra umami, which is common in Korean street food.
- Prevent sogginess: The butter on the bread is key. If you’re making these ahead, butter the bread and assemble, but don’t toast until just before serving.
Serving Suggestions
These sandwiches are often served warm off the griddle, but they’re equally delicious at room temperature. Pair with a simple side of pickled radish (danmuji) or a small green salad. For a full Korean café-style spread, serve with a glass of milk or a cup of barley tea (boricha). They also make a great lunchbox addition—just wrap them in parchment paper.
Variations
- Spicy version: Add 1–2 teaspoons of gochujang (Korean chili paste) or a drizzle of sriracha to the egg salad mixture for a kick.
- Vegetable-packed: Add finely chopped cucumber, shredded carrot, or corn kernels for extra crunch and color.
- No-bread option: Serve the egg salad over crisp lettuce leaves or in a hollowed-out tomato for a low-carb version.
- Herb twist: Stir in 2 tablespoons of chopped chives or green onions for a fresh, oniony note.
- Cheese variation: Swap the American cheese for mozzarella or provolone for a different melt.
Storage and Reheating
Store leftover egg salad (without the bread) in an airtight container in the refrigerator for up to 3 days. The assembled sandwiches are best eaten immediately—they can get soggy. If you must store them, keep them in the fridge for up to 24 hours, but reheat in a skillet or toaster oven to crisp the bread. Reheat to an internal temperature of 165°F (74°C) if you’re reheating leftovers with ham or cheese. Do not freeze assembled sandwiches; the texture will suffer.
Frequently Asked Questions
Can I use regular mayonnaise instead of Korean mayo? Yes. Korean mayonnaise brands like Kewpie are richer and slightly sweeter due to added sugar and MSG. If using regular mayo, you may want to add an extra pinch of sugar to mimic the flavor.
Why does my egg salad turn watery? This usually happens if the eggs are not fully cooled before mixing, or if you add too much mayonnaise. Also, if you use raw onion, it releases moisture—try salting the minced onion and letting it sit for 5 minutes, then squeezing out the liquid before adding.
Can I make this egg salad ahead of time? Yes, you can make the egg salad up to 2 days in advance. Store it in the fridge in an airtight container. Stir well before using, as the mayonnaise may separate slightly.
What kind of bread is best? The ideal is a soft, slightly sweet milk bread (like shokupan or brioche). If you only have regular sandwich bread, that’s fine—just toast it lightly before assembling to help it hold up.
Is this sandwich served hot or cold? Traditionally, it’s served warm after being griddled, which melts the cheese and toasts the bread. But it’s also delicious cold, straight from the fridge, like a classic egg salad sandwich. Both are authentic.
Can I skip the ham and cheese? Absolutely. Many Korean egg salad sandwiches are just bread and egg salad. The ham and cheese are optional add-ons for extra flavor and protein.
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