Soy Cured Egg Yolk

This soy cured egg yolk is rich, creamy, and packed with umami. Marinated in soy sauce, mirin, and garlic, they develop a silky texture that enhances rice, noodles, or toast. With minimal effort, you can create a gourmet topping that elevates any dish.

What is soy cured egg yolk?

Soy cured egg yolk is a popular Japanese side dish where egg yolks are marinated in a mixture of soy sauce with other ingredients. This curing process enhances the yolk’s natural flavor and texture, giving it a rich umami taste and a smooth, custard-like consistency.

In Japanese cuisine, soy sauce is a staple, and its use in various marinades and pickling solutions has been integral to many dishes. Soy-cured egg yolk is part of this tradition, though it’s become more popular in recent years as chefs and home cooks have explored new ways to enjoy egg yolks in savory, umami-rich dishes.

The soy cured egg yolk is typically marinated for 12 to 24 hours, depending on the desired texture, from soft and runny to firm and jammy.

This ingredient is often used to elevate simple dishes like rice, noodles, toast, or sushi, offering an indulgent flavor boost.

Jammy Egg Yolks

Have you ever wondered why raw egg yolks become jammy and firm after being cured in soy sauce?

First, soy sauce is salty and concentrated, and as it interacts with the egg yolk, it draws moisture out through a process called osmosis. As the moisture leaves the yolk, the proteins inside begin to tighten and coagulate, causing the yolk to firm up. The longer the egg yolk sits in the soy sauce, the more moisture is extracted, resulting in a firmer texture.

Additionally, the salt in soy sauce breaks down the proteins in the egg yolk, a process known as denaturation. This causes the proteins to unravel and bond together, further contributing to the yolk’s firmer consistency. This is similar to how the proteins in egg whites firm up when they are cooked.

Ingredients Breakdown

1. Egg Yolks

The choice of eggs is crucial for achieving the best results when making soy-cured egg yolks. Fresh, high-quality eggs are recommended for this recipe, as they have a firmer yolk that will hold up better during the curing process. Fresh egg yolks are less likely to break or spread in the marinade, ensuring that they maintain their shape and firm up nicely.

Did you know that, according to the CDC, about 1 in 20,000 eggs in the United States, and about 1 in 35,000 eggs in Japan, are contaminated with salmonella?

Tip: If you’re concerned about salmonella in raw eggs, check out my article “How to Make Raw Eggs Safe to Eat: Make Salmonella-Free Eggs at Home” to learn how to easily turn your regular store-bought eggs into pasteurized eggs.

2. Soy Sauce

The role of soy sauce in curing egg yolks is essential for adding umami depth and saltiness.

Soy sauce’s umami flavor enhances the natural richness of the egg yolk, giving it a complex, satisfying taste. The saltiness of soy sauce also plays a crucial role in the curing process by drawing moisture out of the egg yolk, which not only firms up the texture but also intensifies the yolk’s flavor.

Tip: When choosing soy sauce, opt for light soy sauce or regular soy sauce for the best balance of flavor. Avoid dark soy sauce, as it can be too thick and overly sweet, which might overpower the egg yolk’s delicate taste. Light soy sauce will provide the right amount of saltiness and depth without masking the other ingredients.

3. Mirin

Mirin is a mild and sweet rice wine that’s often used in Japanese cooking.

Adding mirin to the soy-cured egg yolk sauce is optional, but highly recommended. It helps balance the saltiness of the soy sauce, resulting in a more complex and harmonious flavor. The sweetness of mirin enhances the natural richness of the egg yolk, elevating its umami taste without overwhelming it.

As the mirin’s alcohol content is relatively low (about 8%), it doesn’t overpower the dish, but it helps soften the sharpness of the soy sauce, making the overall taste more rounded and smooth. It contributes to a richer, fuller flavor that balances out the saltiness, while the slight warmth from the alcohol adds a deeper, more nuanced taste to the cured yolks.

If you don’t have mirin on hand, you can substitute it with 2 tbsps sake + ½ tsp sugar to achieve a similar balance of sweetness and acidity.

Tip: If you’re allergic to alcohol, a great substitute would be to use rice vinegar combined with sugar to replicate the acidity and sweetness of mirin. For example, try using 1 tablespoon rice vinegar and 1 tsp sugar to replace the mirin. This will provide a similar balance of sweet and tangy flavors without any alcohol. You can also add a small amount of water (about 1 tablespoon) if you find the acidity too strong.

4. Garlic

Fresh garlic infuses the marinade with a subtle yet savory undertone, contributing to the overall umami profile of the dish. Its mild sharpness and slightly spicy flavor results a more complex, layered flavor profile.

Tip: If you need to substitute garlic, you can use shallots, which offer a mild, sweet, and slightly garlicky flavor. A small amount of chopped onion can provide a similar savory depth to the sauce, though it will add a sweeter, milder flavor compared to garlic. If you prefer not to use fresh garlic but still want to maintain the garlic flavor, a small amount of garlic powder (about 1/4 teaspoon per clove) can be added. However, this won’t provide the same aromatic richness that fresh garlic does.

Variations & Flavor Twists for Soy Cured Egg Yolk

1. Spicy Soy-Cured Egg Yolks: For a spicy kick, add chili flakes or a spoonful of gochujang (Korean chili paste) to the soy sauce marinade. This will introduce a savory heat that pairs beautifully with the richness of the egg yolks.

2. Truffle-Cured Yolks: Elevate the flavor by adding a few drops of truffle oil to the marinade. The earthy, aromatic taste of truffle enhances the yolks, giving them a luxurious twist perfect for gourmet dishes.

3. Dashi-Cured Yolks: Incorporating dashi broth into the marinade adds an extra layer of umami, intensifying the savory depth of the soy-cured yolks. This variation brings a traditional Japanese flavor to the mix.

4. Miso-Cured Yolks: Swap out soy sauce for miso paste to create a miso-cured yolk with a rich, fermented flavor. Miso adds a sweet and salty balance that complements the egg yolk’s natural umami, resulting in a deeper, more complex taste.

5. Sriracha-Cured Egg Yolks: For a bold and spicy twist, incorporate Sriracha sauce into the marinade. This popular hot sauce brings a tangy heat and a touch of sweetness, perfectly complementing the saltiness of the soy sauce and the richness of the egg yolk. Adjust the amount based on your spice tolerance for a mild or fiery kick!

6. Honey-Cured Egg Yolks: For a sweet twist, you can also try curing egg yolks in honey. The honey will coat the yolks, infusing them with a rich, sweet flavor that contrasts nicely with the yolk’s natural richness. Simply coat the yolks in honey and refrigerate for 24 hours to allow the sweetness to permeate and firm up the yolks. The result is a jam-like sweet egg yolk perfect for spreading on toast.

Storage of Soy Cured Egg Yolk

To store soy-cured egg yolks properly, keep them in an airtight container in the refrigerator. If you want them to maintain their current texture, transfer the yolks out of the marinade after curing and store them separately. This helps prevent them from continuing to firm up.

If you leave the yolks in the soy sauce marinade, they will continue to cure and firm up over time, which can lead to a more jammy consistency. Both methods are fine, depending on your texture preference, but make sure to consume them within 1-2 days for the best taste and texture.

To know if the yolks are no longer good to eat, check for any off smells, discoloration, or an overly slimy texture. If they seem too firm, dry, or have any mold growth, discard them. Always store the yolks in the fridge to maximize their shelf life and ensure safety.

How to Enjoy Soy-Cured Egg Yolks

Soy-cured egg yolks can be enjoyed in a variety of ways, adding a savory umami boost to many dishes.

On Rice or Noodles: Place a soy-cured egg yolk over a bowl of warm rice or noodles for a rich, flavorful topping. It pairs especially well with dishes like ramen, donburi, or onigiri.

As a Topping for Toast: Spread the soy-cured egg yolk just like butter on a slice of buttered toast for a simple yet indulgent breakfast or snack. The creamy yolk adds depth and richness to the toast.

In Salads: Crumble or slice the yolk over a salad to add an extra layer of flavor. It works better with firmer cured egg yolks when you can chop or break them into smaller pieces.

In Sushi or Sashimi: Use the soy-cured egg yolk as a topping for sushi or sashimi, adding a touch of luxury to your meal. It pairs particularly well with tuna, salmon, or other delicate fish.

Mashed into Sauces: Mash the cured yolk and mix it into sauces for pasta, steak, or grilled vegetables to introduce a creamy, umami-packed element.

Equipment

• 1 Small bowl or shallow container (for mixing the marinade and curing the yolks.)
• Measuring cups and spoons
• Paper towel (to cover the egg yolks and absorb the sauce.)

Ingredients  

• 6 eggs (Only using egg yolks)
• ½ cup soy sauce (Use light soy sauce or regular soy sauce. Avoid using dark soy sauce.)
• 2 tbsps mirin (Can be substituted with 2 tbsps sake + ½ tsp sugar)
• 1 clove of garlic (Peeled and sliced)

Instructions 

1. In a small bowl or shallow container, combine the soy sauce, mirin, and sliced garlic. Stir to mix evenly.

2. Carefully separate the egg yolks from the whites, ensuring the yolks remain intact. (Save the egg whites for other recipes, like Meringue Cookies, egg white cakes, or egg fried rice.)

3. Gently place the yolks into the soy sauce mixture.

4. Place a small sheet of paper towel over the yolks, allowing it to absorb the sauce. This helps ensure the tops of the yolks stay fully coated in the marinade.

5. Cover the container with plastic wrap or a lid and refrigerate for 12 to 24 hours. For a firmer, jammy texture, cure for about 24 hours; for a softer, runnier consistency, 12 hours will suffice.

6. Serve the soy cured egg yolk over warm rice, onigiri, noodles, or toast. Or you can mash it into sauce for extra umami flavor.

Storage: If not serving immediately, store the yolks in an airtight container in the fridge and consume within 1-2 days. You can keep them in the soy sauce marinade, where they will continue to firm up over time, or transfer them to a new container without the marinade to maintain their current texture.

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