Soy Sauce Marinated Boiled Eggs (Ajitsuke Tamago)

These soy sauce marinated boiled eggs, known as ajitsuke tamago in Japan, are soft-boiled eggs soaked in a savory-sweet marinade until the whites take on a deep amber hue and the yolks develop a creamy, custard-like texture. They are the perfect topping for ramen, rice bowls, or salads, and they are surprisingly simple to make at home. The marinade does all the work, transforming plain eggs into a flavorful, umami-packed treat.

Ingredients

6 large eggs
1/2 cup (120 ml) soy sauce
1/2 cup (120 ml) mirin
1/4 cup (60 ml) sake (or dry sherry, or omit and add 2 tablespoons water)
1/4 cup (50 g) sugar
1 clove garlic, smashed (optional)
1 slice fresh ginger (optional)

Instructions

Boil the eggs: Bring a pot of water to a rolling boil (enough to cover the eggs by an inch). Carefully lower the eggs into the boiling water using a slotted spoon. Boil for exactly 6 minutes 30 seconds for a jammy, soft yolk, or 7 minutes for a slightly firmer yolk. For a fully hard-boiled yolk, cook for 9-10 minutes.
Ice bath: While the eggs cook, prepare a bowl of ice water. When the timer goes off, immediately transfer the eggs to the ice bath using the slotted spoon. Let them sit for at least 5 minutes to stop the cooking process and make them easier to peel.
Peel carefully: Gently tap the eggs on the counter to crack the shell, then roll them between your hands to loosen it. Peel under running water to help remove any stubborn bits of shell. Set the peeled eggs aside.
Make the marinade: In a small saucepan, combine the soy sauce, mirin, sake, sugar, garlic, and ginger (if using). Bring to a gentle simmer over medium heat, stirring occasionally, until the sugar has dissolved. Remove from heat and let cool completely to room temperature.
Marinate: Place the peeled eggs in a shallow container or a resealable plastic bag. Pour the cooled marinade over the eggs. They should be mostly submerged; if not, turn them occasionally. Cover and refrigerate for at least 4 hours, or up to 24 hours. For a lighter flavor, 4-6 hours is ideal; for a deeper, saltier flavor, marinate longer.
Serve: Remove the eggs from the marinade, cut in half lengthwise, and serve. The marinade can be strained and reused once more, but it will be less potent.

Tips

Use older eggs for easier peeling: Eggs that are a week or two old peel more easily than very fresh ones. If you only have fresh eggs, add a teaspoon of baking soda to the boiling water—this helps loosen the shell.
Don’t overcook the yolks: The magic of this dish is the creamy, slightly runny yolk. Set a timer and stick to it. If you prefer a firmer yolk, cook for 8 minutes, but know that the texture will be less luxurious.
Marinade substitutions: If you don’t have mirin, you can substitute with 1/4 cup (60 ml) dry white wine plus 1 teaspoon sugar. If you don’t have sake, simply omit it and add 2 tablespoons (30 ml) of water to keep the balance.
Don’t marinate too long: Leaving the eggs in the marinade for more than 24 hours will make them overly salty and the texture of the whites will become rubbery. Stick to the recommended time.

Serving Suggestions

These eggs are most famously served atop a steaming bowl of ramen, but they are incredibly versatile. Slice them over a bowl of steamed rice with a drizzle of the marinade and some chopped scallions for a quick meal. They also make a great addition to a Japanese-style breakfast, a green salad, or as a protein-packed snack on their own.

Variations

Spicy: Add 1-2 teaspoons of chili oil or a few slices of fresh chili to the marinade for a spicy kick.
Tea eggs: For a Chinese-style variation, add 2 black tea bags, 1 cinnamon stick, and 2 star anise to the marinade. The eggs will take on a beautiful marbled pattern if you gently crack the shells before marinating (leave them on).
Smoky: Add a few drops of liquid smoke to the marinade for an unexpected smoky depth.
Vegan: You can use the same marinade on tofu cubes or mushrooms. Boil or pan-fry the tofu, then marinate for a similar umami flavor.

Storage and Reheating

Marinated eggs can be stored in the marinade in an airtight container in the refrigerator for up to 4 days. After that, the texture and saltiness will be off. If you have eggs that have been marinated and then removed from the liquid, they will keep for 3 days in a sealed container. These eggs are best served cold or at room temperature; reheating them will overcook the yolks. If you must, you can gently warm them in a bowl of hot water (not boiling) for a few minutes, but this is not recommended.

Frequently Asked Questions

Can I use hard-boiled eggs? Yes, you can, but the texture will be quite different. Hard-boiled eggs will be firmer and the yolk will be crumbly rather than creamy. They will still absorb the marinade’s flavor, but the result is less luxurious.

Do I have to use mirin and sake? No, but they add a depth of flavor that is hard to replicate. Mirin provides sweetness and a slight tang, while sake adds a subtle complexity. If you don’t have them, you can substitute the mirin with a mix of white wine and sugar, and the sake with water or a splash of dry sherry.

Why are my eggs so hard to peel? The most common reason is using very fresh eggs. As eggs age, the pH level of the white increases, making it less likely to stick to the shell. Also, shocking the eggs in an ice bath immediately after boiling is crucial. Peeling under running water also helps.

Can I reuse the marinade? Yes, you can reuse it once or twice, but it will be less flavorful each time. After using, strain it to remove any bits of egg or aromatics, bring it to a boil, and cool it before using again. After the second use, it’s best to discard it.

How do I get the perfect jammy yolk? The key is timing and temperature. Boiling the eggs for exactly 6 minutes 30 seconds at a rolling boil, followed by an immediate ice bath, will give you a yolk that is set on the outside but still slightly runny in the center. Adjust the time by 30 seconds for your preferred consistency.

Can I make these ahead of time? Absolutely. This is a great make-ahead dish. The eggs can be marinated and stored in the refrigerator for up to 4 days. They are perfect for meal prep or for having on hand for a quick ramen night.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

Spotted an error? Tell us and we will correct it (corrections policy).