Spoiler: eel sauce has no eel. Just four pantry ingredients, soy sauce, mirin, sugar, and sake, simmered into that glossy, sweet-savory drizzle you get at Japanese restaurants. It's so easy my kids make it themselves at this point. Ten minutes, one saucepan, done.
Whenever I'm making sushi bake, eel sauce is non-negotiable, it has to be on the table. Same goes for spam musubi nights. My kids ask for it every time we go to a Japanese restaurant, so I started keeping a jar of it in the fridge at all times. Cheaper than store-bought, better flavor, and ready in the time it takes to cook rice.
Save This Recipe 💌
We'll email this post to you, so you can come back to it later!
Jump to:
- What Is Unagi Sauce?
- What Does Eel Sauce Taste Like?
- Eel Sauce vs. Teriyaki Sauce: What's the Difference?
- The 4 Ingredients
- How to Make Eel Sauce
- How to Know When It's Ready
- Ways to Use Unagi Sauce
- Flavor Variations
- Storage and Shelf Life
- Troubleshooting
- Recipe FAQs
- More Japanese Recipes to Try
- Did you try this recipe?
- Eel Sauce (Unagi Sauce)
What Is Unagi Sauce?
Unagi sauce also called unagi no tare or kabayaki sauce, is a Japanese glaze made for grilled eel. The name stuck even though the sauce itself contains zero eel. It's just those four simple ingredients cooked down into something sticky, glossy, and deeply savory-sweet.
What Does Eel Sauce Taste Like?
Bold, sweet, and savory, with a deep umami backbone. The sugar caramelizes as it reduces, giving you a slightly rich, almost molasses-like sweetness balanced by the salt of the soy sauce and the mild tang of mirin. The consistency lands somewhere between honey and a light syrup, thick enough to coat a spoon and cling to whatever you drizzle it on.
If you've had teriyaki sauce, you're in the same neighborhood. Eel sauce is just a little sweeter and more concentrated.
Eel Sauce vs. Teriyaki Sauce: What's the Difference?
They're close, but not the same. Both use soy sauce, mirin, and sugar. The difference comes down to two things: sake and ratio.
Teriyaki sauce typically uses more soy sauce relative to the sweetener, giving it a more savory, balanced profile, and it's often used as a marinade before cooking. Eel sauce leans sweeter and is almost always used as a finishing glaze or drizzle, brushed on after cooking or added right before serving.
The short version: teriyaki is a marinade that becomes a glaze. Eel sauce is always the glaze.
The 4 Ingredients
- Soy Sauce: The savory base. Regular soy sauce works well here; tamari works too if you need gluten-free.
- Mirin: A sweet Japanese rice wine that gives the sauce its signature glossy finish and mild tang. Don't skip it if you can help it.
- Sake: Adds depth and rounds out the sweetness. Optional, but worth it.
- Sugar: White sugar is classic, but brown sugar gives a slightly deeper, more molasses-like flavor.
The base ratio is equal parts soy sauce and mirin, with sugar adjusted to taste. A good starting point: 2 parts soy sauce, 2 parts mirin, 1 part sugar. Scale up or down from there.
Substitutions
- No sake? Skip it, or use a small splash of dry white wine. It still works.
- No mirin? Use rice vinegar plus a bit of extra sugar. The flavor won't be identical, but it's close enough.
- Gluten-free? Swap in tamari, one-for-one.
- No refined sugar? Honey or maple syrup both work. Honey keeps it closest to the original; maple syrup gives it a slightly different sweetness.
- Vegan? Use coconut aminos instead of soy sauce. It's naturally sweeter, so ease up on the sugar.
How to Make Eel Sauce
- Combine soy sauce, mirin, sugar, and sake in a small saucepan over medium heat.
- Stir continuously to dissolve the sugar, bringing the mixture to a simmer.
- Lower the heat and let it simmer for 8-10 minutes until the sauce thickens.
- Remove from heat and let it cool slightly before using. The sauce will thicken more as it cools.
How to Know When It's Ready
This is where most people second-guess themselves. The sauce won't look thick while it's hot, it will still look fairly thin in the pan. That's normal.
The test: dip a spoon in and lift it out. If the sauce coats the back of the spoon and doesn't run off immediately, it's done. It will thicken to a proper glaze consistency as it cools to room temperature.
If you let it go too long on the heat, it will get too thick and sticky once cooled. If that happens, stir in a small splash of warm water to loosen it.
For spam musubi or rice bowls, a slightly thinner sauce drizzles better. For glazing grilled proteins, let it reduce a little further for a thicker, stickier coat.
Ways to Use Unagi Sauce
The obvious ones first: sushi rolls, nigiri, sushi bake, spam musubi. But this sauce goes well beyond Japanese food.
- Sushi bake: Drizzle generously over the top before serving.
- Spam musubi: Brush on the spam before or after pan-frying.
- Grilled or pan-seared salmon: Brush on in the last two minutes of cooking.
- Chicken: Drizzle over grilled or pan-seared thighs, or use as a finishing glaze.
- Chicken karaage: Drizzle on top for an extra layer of savory-sweet.
- Rice bowls: A little goes a long way over plain steamed rice.
- Roasted vegetables or tofu: Especially eggplant, which soaks up the glaze well.
- Stirred into spicy mayo: Half sriracha mayo, half eel sauce makes a solid sushi sauce.
- Spicy tuna sushi bake: Drizzle alongside sriracha mayo for the full effect.
- Gyoza dipping sauce: Mix with a little rice vinegar for balance.
Flavor Variations
Once you have the base down, it's easy to riff on it.
- Spicy: Add a pinch of chili flakes or a small squeeze of sriracha while it simmers.
- Garlic: Stir in one clove of minced garlic at the start for a deeper, more savory finish.
- Ginger: Add a half teaspoon of freshly grated ginger. Good on fish especially.
- Citrus: A small splash of yuzu juice or fresh orange juice, added off the heat, brightens it up.
- Brown Sugar: Swap in for white sugar if you want a richer, slightly smoky-sweet flavor.
Storage and Shelf Life
Let the sauce cool completely before storing, then transfer it to a small jar or airtight container.
- Fridge: Up to 2 weeks. The sauce will thicken in the cold; just let it come to room temperature before using, or warm it briefly.
- Freezer: Pour into an ice cube tray, freeze solid, then transfer the cubes to a zip bag. Good for up to 2 months. Each cube is about a tablespoon, easy to grab exactly what you need.
Making a double batch is worth it. It takes the same amount of time either way, and you'll use it.
Troubleshooting
- My sauce won't thicken. It will, just not while it's still hot. Take it off the heat, let it cool for 10 to 15 minutes, and check again. If it's still too thin after cooling, return it to the pan over low heat and simmer for another 2 to 3 minutes.
- My sauce is too thick. Stir in warm water, one teaspoon at a time, until it reaches the consistency you want.
- My sauce tastes too salty. Add a small splash of mirin or a pinch more sugar to balance it out.
- My sauce tastes too sweet. Add a small splash of soy sauce and stir to combine.
- The sugar burned. This happens on high heat. Start over with medium or medium-low, and stir continuously until the sugar dissolves before you step away from the pan.
Recipe FAQs
Because it was traditionally used to glaze grilled eel (unagi kabayaki). The name stuck, even though the sauce itself is just soy, mirin, and sugar.
They’re basically the same thing. Kabayaki refers to the style of grilling eel that’s brushed with the sauce, while unagi sauce is the actual glaze. So when you hear “kabayaki sauce,” it’s just unagi sauce used specifically for grilled eel.
Yes. Swap mirin with a mix of rice vinegar + sugar. For sake, just skip or use dry white wine for depth. It won’t be 100% authentic, but still delicious.
Definitely. Brush it on chicken, salmon, or tofu before grilling. Just keep an eye on heat because of the sugar, it caramelizes quickly.
It’s all about reduction. Simmer gently, taste as you go, and remember it thickens as it cools. If it’s too salty, add a splash of water or extra mirin.
More Japanese Recipes to Try
Did you try this recipe?
Share how it turned out in the comment box below, and if you loved it, share it on Facebook, Pinterest & Instagram.
Thank you!
Eel Sauce (Unagi Sauce)
Equipment
- 1 small pot
Ingredients
- ¼ cup soy sauce
- ¼ cup mirin
- 2 tablespoon sake
- 3 tablespoon white sugar
Instructions
- Combine soy sauce, mirin, sugar, and sake in a small saucepan over medium heat.
- Stir continuously to dissolve the sugar, bringing the mixture to a simmer.
- Lower the heat and let it simmer for 8-10 minutes until the sauce thickens.
- Remove from heat and let it cool slightly before using. The sauce will thicken more as it cools.
Save This Recipe 💌
We'll email this post to you, so you can come back to it later!
Notes
- Use low heat to avoid burning the sugar, which can alter the flavor of the sauce.
- Taste the sauce as it cooks and adjust sweetness or saltiness according to your preference.
- Make a larger batch and freeze portions for future use.
