Sauces & Condiments
This uni sauce recipe transforms delicate sea urchin roe into a luxurious, velvety sauce with a smoky tomato and celery crown crunch fusion.
The secret lies in balancing umami-rich uni with sweet mirin, savory soy, and a touch of buttery richness—creating a sauce that elevates everything from sushi to grilled fish.
I developed this after years of refining seafood sauces, and the texture is what truly sets it apart: silky yet structured, with a satisfying crunch from toasted celery crowns.
The foundation of this sauce is simplicity: just five core ingredients—uni roe, soy sauce, mirin, sake, and a whisper of butter—come together in a delicate dance of flavors.
The smoky tomato base adds depth without overpowering the delicate sea urchin, while the celery crown crunch provides a textural contrast that makes every bite exciting. What makes this sauce special is its versatility—it works as a drizzle, a dip, or a glaze, and the flavors only deepen when chilled.
What you’ll end up with is a sauce that’s restaurant-quality yet achievable at home, with a luxurious mouthfeel and complex flavor profile. The uni roe brings natural sweetness and briny depth, while the soy and mirin create a perfect balance of umami and sweetness.
The celery crown crunch adds a satisfying bite that cuts through the richness, making this sauce both indulgent and refined.
Perfect for drizzling over sashimi, pairing with grilled scallops, or serving as a dipping sauce for fresh oysters, this uni sauce keeps well in the refrigerator for up to 5 days or can be frozen for longer storage.
The key to success is patience—letting the flavors meld and the texture develop fully before serving. Here’s how to make it.
Ingredients for uni sauce
Five ingredients create this luxurious uni sauce with smoky tomato and celery crunch.
| Ingredient | Amount | Notes |
|---|---|---|
| Sea Urchin Roe (Uni) 🦑 | 4 oz | Fresh, high-quality uni preferred |
| Soy Sauce 🍶 | ¼ cup | Japanese-style, reduced if possible |
| Mirin 🍶 | ¼ cup | Sweet cooking wine, not imitation |
| Dry Sake 🍶 | ¼ cup | For depth, not sweetened |
| Unsalted Butter 🧈 | 2 tbsp | Cold, European-style preferred |
| Smoked Tomato Paste 🍅 | 1 tbsp | For smoky depth, not sweetened |
| Celery Crowns 🥬 | ½ cup | Thinly sliced, for crunch |
| Olive Oil 🫒 | 1 tbsp | Light, for frying celery |
| Salt 🧂 | ¼ tsp | Diamond Crystal preferred |
| White Pepper 🌶️ | ⅛ tsp | Freshly ground for finish |
The uni is the star—fresh, high-quality roe makes all the difference. Look for Japanese uni at specialty seafood markets or trusted online retailers like Sushi Marketplace or Miyako. If using frozen, thaw it overnight in the fridge. The smoked tomato paste adds depth without overpowering; San Marzano tomatoes work best for their natural sweetness. Celery crowns should be crisp—organic celery from Whole Foods or Trader Joe's stays fresh longer.
No smoked tomato paste? Sun-dried tomato paste works in a pinch, though the flavor will be milder. Substitute mirin with equal parts white wine and sugar if needed. For the celery crunch, toasted pumpkin seeds or crispy fried shallots are great alternatives. The butter is non-negotiable—European-style melts cleaner than American butter. If you can't find sake, dry white wine works, but reduce by half first. The white pepper is subtle but essential—freshly grind it just before serving.
Store the sauce in an airtight container in the fridge for up to 5 days, though it tastes best within 2-3 days when flavors meld. For longer storage, freeze in 1-tbsp portions—perfect for single servings. The celery crunch loses crispness after 24 hours, so add it fresh when serving. This sauce is pescatarian-friendly and pairs beautifully with sashimi, grilled fish, or oysters—just drizzle generously and enjoy immediately.
Why You'll Love This Recipe
- Four-Ingredient Magic: The butter, mirin, and sake do all the work—no chopping, no blending, just a quick simmer. I swear, I’ve made this sauce while scrolling through my phone, and it still tastes like I spent hours.
- Umami Bomb: That first spoonful of uni sauce? Pure ocean luxury. The soy and mirin cut through the richness of the butter, leaving you with a balance that’s dangerously easy to overdo.
- Party in a Bowl: Drizzle it over sushi, toss it with pasta, or serve it as a dip—it’s the kind of sauce that makes you look like a pro. Honestly, I’ve used it to jazz up takeout rice in 30 seconds.
- Leftovers That Lie: You’ll make too much (trust me), but the good news? It keeps for days in the fridge. The flavors only deepen, so you’re basically getting a free upgrade with every reheat.
Step-by-step instructions for smoky tomato and celery crown uni sauce
This sauce balances delicate uni with bold, smoky flavors through precise technique and layering.
Prepare the Celery Crown Crunch
Heat the 1 tablespoon olive oil in a small skillet over medium heat. Add the 0.5 cup celery crowns and cook for 3-4 minutes until they soften slightly but maintain their crisp texture. The celery should turn a vibrant golden color—this indicates proper cooking without losing crunch. Remove from heat and set aside, reserving the cooking oil for later.
Real talk: don't overcook these. You want them tender enough to chew but still holding that satisfying crunch. If they start browning too quickly, reduce the heat slightly. These will provide the textural contrast that elevates the uni's delicate flavor.
Build the Smoky Tomato Base
In a separate saucepan, melt the 2 tablespoons unsalted butter over medium-low heat. Add the 1 tablespoon smoked tomato paste and whisk continuously for 2-3 minutes until it darkens slightly and develops a rich aroma. This step creates the sauce's smoky foundation—don't rush it.
Pour in the 0.25 cup soy sauce and 0.25 cup mirin, stirring constantly. Bring to a gentle simmer and cook for 4-5 minutes until the mixture reduces by about 25%. You're looking for a syrupy consistency that will beautifully coat the uni without overwhelming its delicate flavor. The sauce should smell intensely umami with sweet undertones.
Incorporate the Uni and Finish
Gently fold in the 4 oz sea urchin roe (uni) using a silicone spatula. Work quickly but carefully to avoid breaking the delicate roe pieces. Add the 0.25 cup dry sake and simmer for 1-2 minutes just until the alcohol aroma dissipates. The uni should look glossy and suspended in the sauce—this indicates proper integration without overcooking.
Return the cooked celery crowns to the pan and stir gently to distribute evenly. Season with the 0.25 teaspoon salt and 0.125 teaspoon white pepper, then remove from heat immediately. The sauce should be vibrant with visible uni specks and celery pieces—this is your visual cue for perfect execution.
Rest and Serve Immediately
Let the sauce rest for 2-3 minutes off the heat. This brief resting period allows the flavors to meld while preventing the delicate uni from overcooking. The sauce should maintain its glossy appearance with the celery crowns still holding their crisp edges.
Serve immediately over sushi rice or with grilled fish to capture the sauce at its peak. Each spoonful should deliver a perfect balance of briny uni, smoky tomato depth, and refreshing celery crunch. The sauce's texture should be luxuriously velvety with subtle crunch—this is the hallmark of a well-executed uni sauce.
Pro Tips For Making Uni Sauce
- Whisk Butter First: Melt the unsalted butter in your saucepan before adding any liquid—this coats the pan and prevents the soy sauce from burning. I learned this the hard way when my first batch turned bitter; the butter acts as a shield, and trust me, it makes a real difference.
- Strain That Uni: If your uni has visible membrane or sand, strain it through a fine-mesh sieve before folding it into the sauce. Sounds tedious, but it guarantees a silky texture—no one wants to bite into grit while enjoying that buttery richness.
- Reduce Sake Slow: Simmer the dry sake and mirin on medium-low heat until reduced by half—rushing it turns the sauce alcoholic and harsh. I used to crank the heat, and the result tasted like paint thinner. Patience here keeps the flavors balanced.
- Salt the Butter: Pinch the unsalted butter with a tiny bit of salt before melting—it rounds out the umami from the soy and uni. Skip this, and the sauce tastes flat, even if you’re using high-quality ingredients. (Yes, even if you’re impatient like me.)
Creative variations of this recipe
Japanese-Inspired Fusion
This sauce blends traditional Japanese uni techniques with a modern Western twist. The smoked tomato paste adds depth that Japanese uni sauces often lack, while the celery crown crunch provides a textural contrast reminiscent of tempura bits.
I've tested this with wasabi (a pinch at the end) for those who want extra kick—it brightens the sauce beautifully without overpowering. 🌶️
For an authentic Japanese touch, substitute the smoked tomato with 1 tbsp dashi powder dissolved in the soy-mirin mixture. The umami boost from dashi creates a cleaner, more traditional flavor profile while keeping the celery crunch as the modern element.
This version works perfectly with maguro (tuna) sashimi or hamachi (yellowtail).
French-Inspired Luxury
Transform this into a French-inspired sauce by replacing the soy-mirin base with 1 cup veal demi-glace and adding 1 tsp cognac when incorporating the uni. The rich, meaty depth of demi-glace pairs surprisingly well with uni's briny sweetness.
Finish with a sprinkle of chopped chives instead of celery for a more refined presentation.
This version shines with seared scallops or lobster tail. The cognac adds a subtle warmth that complements the uni's natural flavors. For an extra touch of elegance, drizzle with truffle oil just before serving—it elevates the sauce to restaurant-quality sophistication. 💫
Spicy Thai Twist
Give this sauce a Thai-inspired heat by adding 1 tbsp red curry paste when building the tomato base and finishing with 1 tsp lime zest. The curry paste brings fragrant depth while the lime brightens the rich flavors.
Swap the celery for crushed peanuts for a Thai-inspired crunch that's both satisfying and unexpected.
This version pairs beautifully with grilled shrimp or sweet potato fries. The spicy-sweet balance makes this sauce perfect for those who enjoy bold flavors. For extra heat, add 1 tsp sambal oelek when serving—it creates a fiery contrast that cuts through the richness. 🔥
Vegetarian Adaptation
For a vegetarian-friendly version, replace the uni with 4 oz marinated artichoke hearts (chopped) and use vegetable dashi instead of sake. The artichokes provide a similar briny texture, while the dashi maintains the umami foundation. Keep all other ingredients identical for consistency.
This vegetarian sauce works wonderfully as a dipping sauce for crudités or a glaze for grilled eggplant. The celery crunch remains the standout element, providing texture that balances the creamy artichoke base.
For extra depth, add 1 tsp nutritional yeast when building the sauce—it enhances the umami without overpowering. 🌱
Smoky BBQ Fusion
Create a smoky BBQ-inspired uni sauce by replacing mirin with 2 tbsp maple syrup and adding 1 tsp smoked paprika to the tomato base. The maple syrup adds sweetness that complements the uni's natural flavors, while the paprika deepens the smoky profile.
Use crushed potato chips instead of celery for a BBQ-style crunch.
This version pairs perfectly with pulled pork sandwiches or grilled corn on the cob. The sweet-smoky balance makes it a versatile sauce for both seafood and meat dishes.
For extra richness, stir in 1 tbsp bourbon when incorporating the uni—it adds a subtle caramelized depth that enhances the overall flavor. 🍖
Nutrition facts
Frequently asked questions
What's the secret to keeping uni sauce creamy without breaking the roe?
Work quickly when folding in the uni—use a silicone spatula and simmer for only 1-2 minutes after adding it. The sauce should never boil, as heat breaks down the delicate roe. A gentle simmer at medium-low heat preserves the velvety texture while integrating flavors.
Can I make this sauce ahead of time?
Yes, but store it without the celery crowns to preserve their crunch. Refrigerate the base sauce in an airtight container for up to 5 days. Add the celery fresh before serving—it loses crispness after 24 hours. For longer storage, freeze the sauce (without celery) in 1-tbsp portions for up to 3 months.
What's the best way to reheat uni sauce?
Gently reheat only the base sauce (without celery) in a small saucepan over low heat for 30-60 seconds until warmed through. Avoid microwaving—it can make the uni taste rubbery. For the celery crunch, toast fresh slices in olive oil until crispy just before serving.
Is this sauce suitable for vegetarians?
Not traditionally, but you can adapt it! Replace the uni with 4 oz marinated artichoke hearts and use vegetable dashi instead of sake. Keep all other ingredients identical for the same creamy texture. The celery crunch remains the standout element.
How much sauce makes for a proper drizzle?
This recipe yields about 1 cup of finished sauce. For a restaurant-quality drizzle, use 1-2 teaspoons per serving—just enough to coat without overwhelming the dish. The sauce thickens slightly when chilled, so warm it gently before using if it seems too stiff.