Sauces & Condiments
This uni sauce recipe transforms delicate sea urchin into a luxurious, velvety cream that elevates any seafood dish. The briny sweetness of uni blends seamlessly with a delicate celery crown crunch, creating a sauce that’s both elegant and deeply umami.
I developed this after years of refining Japanese techniques to deliver restaurant-quality results at home—no fancy equipment required.
The secret lies in balancing the rich, oceanic flavor of uni with a light, airy base. We start by whisking uni with a touch of cream and lemon, then finish with finely minced celery for texture and freshness.
The result? A sauce that’s silky enough to drizzle over sushi or sashimi but bold enough to stand alone as a dip for grilled fish or oysters.
What makes this sauce truly special is its versatility. Use it as a finishing touch for delicate seafood dishes, a drizzle over chilled noodles, or even as a dip for fresh oysters. The celery crown adds a subtle crunch that cuts through the richness, ensuring every bite is perfectly balanced.
Perfect for seafood lovers, this uni sauce is a game-changer for pescatarians and anyone who appreciates the ocean’s finest flavors. Let’s create something extraordinary together.
Ingredients for uni sauce
Four ingredients transform uni into a velvety, restaurant-worthy sauce with celery crown crunch.
| Ingredient | Amount | Notes |
|---|---|---|
| Fresh Uni (Sea Urchin) 🦀 | 4 oz | High-quality, fresh or pasteurized |
| Heavy Whipping Cream 🥛 | ½ cup | Full-fat for best texture |
| Fresh Lemon Juice 🍋 | 1 tbsp | Freshly squeezed, no pulp |
| Celery Stems 🧅 | 2 whole | Organic, firm, and fresh |
| Extra-Virgin Olive Oil 🫒 | 2 tbsp | Light and fruity |
| Diamond Crystal Kosher Salt 🧂 | ¼ tsp | Fine grain preferred |
| White Wine Vinegar 🍷 | 1 tsp | Dry variety for balance |
| Fresh Chives 🌿 | 2 tbsp | Finely chopped, for garnish |
Uni is the star here—look for fresh, high-quality uni at specialty seafood markets or well-stocked grocery stores like Whole Foods or Trader Joe's. The fresher, the better, but pasteurized uni works too if you can't find fresh. Celery should be firm and vibrant (no wilted stems!). For the cream, full-fat is non-negotiable—it creates that luscious texture. If you're using fresh uni, work quickly to avoid overmixing, which can make the sauce grainy. Pro tip: Squeeze the lemon juice last to preserve its brightness.
No fresh uni? Pasteurized uni tubes from Japanese markets are a great backup, but the flavor won't be as vibrant. Short on celery? Substitute finely minced fennel or green onion for a different but still elegant crunch. The olive oil matters—avoid strong, peppery varieties here. If you're out of white wine vinegar, rice vinegar at half the amount works in a pinch. For a richer sauce, add a splash of vegetable or seafood stock (just 1 tbsp). And if you're feeling fancy, toasted sesame oil (½ tsp) adds depth.
This sauce is best made fresh, but it keeps for 2 days in the fridge if stored in an airtight container with a thin layer of olive oil on top. For longer storage, freeze in ice cube trays—thaw and whisk before using. The celery crown can be prepped ahead and stored separately for up to 3 days. I love making extra to drizzle over chilled soba noodles or as a dip for fresh oysters. Garnish with fresh chives right before serving—they add a pop of color and freshness.
Why You'll Love This Recipe
- Four-Ingredient Magic: The celery stems and olive oil base take two minutes to blitz in a food processor—no chopping, no fuss. I’m talking throw-in-while-you-wait kind of easy.
- Bright Creamy Luxe: That first swirl of uni sauce on pasta? The lemon cuts through the richness of the cream while the sea urchin adds this unexpected briny sweetness. It’s like a fancy seafood dish sneaking up on you.
- Date Night or Lazy Night: Drizzle it over toasted sourdough for a breakfast that feels like a splurge, or toss it with linguine for a dinner that takes less effort than ordering takeout. (Yes, even on a Tuesday night.)
- Leftovers That Still Shine: The sauce keeps for days in the fridge—better than most store-bought versions—and the flavor only deepens. I’ve had it cold on crackers, reheated over rice, and even as a dip for fresh oysters. No waste, all win.
Step-by-step instructions for uni sauce recipe
This silky sea urchin sauce comes together in minutes with just a few simple steps.
Prepare the Celery Crown Crunch
Trim the ends off the 2 whole celery stems and cut each stem into ¼-inch thick slices. You'll end up with about 12-15 slices total. Transfer these to a small skillet and cook over medium-low heat with 1 tablespoon of the extra-virgin olive oil for 3-4 minutes, stirring occasionally, until the edges begin to turn golden.
Here's the thing—you want them tender but still holding their shape, not mushy. Remove them from the pan and set aside on a paper towel to drain any excess oil. These crispy celery slices will add a beautiful textural contrast to your sauce. Don't skip this step; it makes all the difference in the final presentation.
Whisk Together the Cream Base
In a medium saucepan, combine the 0.5 cup heavy whipping cream, 1 tablespoon fresh lemon juice, 1 teaspoon white wine vinegar, and 0.25 teaspoon diamond crystal kosher salt. Place this over medium-low heat and warm gently, stirring occasionally, until it reaches 160°F—just until small bubbles begin to form around the edges but before it actually boils.
Watch carefully—once it starts to bubble vigorously, it's too hot and will break the cream. The goal is a warm, silky cream base that's ready to incorporate the uni. Remove the pan from heat once it reaches temperature, as you'll be adding the sea urchin next.
Add the Fresh Uni and Finish
Immediately after removing the cream from heat, gently fold in the 4 oz fresh uni (sea urchin) using a silicone spatula. Work quickly but carefully to avoid breaking up the delicate uni too much—you want to preserve its beautiful texture. Stir just until fully incorporated, which should take about 30 seconds. The sauce should be smooth with a velvety consistency.
Return the sauce to low heat for just 1 minute to gently warm through. You're not cooking the uni—just letting it meld with the warm cream. If you notice any separation, gently whisk to re-emulsify. The sauce should be silky and glossy, ready to be served immediately over your favorite seafood.
Garnish and Serve
Divide the warm uni sauce among serving bowls. Spoon the reserved celery crowns over the top, arranging them in a decorative pattern. Finish with the 2 tablespoons finely chopped fresh chives, sprinkling them evenly over each serving. The contrast of the crispy celery against the silky sauce creates a perfect balance of textures.
Serve immediately while everything is at its peak temperature. The warm cream will highlight the delicate sweetness of the uni, while the vinegar and lemon juice brighten the flavors. This sauce pairs beautifully with grilled fish, oysters, or even as a luxurious topping for sushi rolls. Enjoy while fresh—this dish doesn't wait!
Pro Tips For Making Uni Sauce
- Whisk Cream Cold: Heavy whipping cream loves a chill. After adding lemon juice and celery, pop the sauce in the fridge for 10 minutes before blending—it emulsifies smoother and doesn’t break when you heat it later. I used to ignore this, and my sauce would split like a bad marriage.
- Strain the Celery: Celery stems add depth, but you don’t want grit. Finely chop them, then strain the mixture through a fine-mesh sieve before blending. Sounds tedious, but it keeps the sauce silky—no one’s tasting celery pulp, just texture.
- Salt the Uni Last: Uni is already briny—taste it first. Add salt to the sauce after blending, then adjust. I learned this the hard way when I over-salted a batch and had to salvage it with extra cream. Now I taste as I go.
- Warm Cream Slowly: Heat the cream over low heat—no simmering, just a gentle shiver. If it gets hot, the sauce will curdle when you mix it with the uni. I used to rush it, and the result was lumpy. Patience here means a velvety finish.
Dietary considerations for this recipe
Pescatarian-Friendly
This uni sauce is a dream for pescatarians—it’s packed with oceanic flavor while being completely free from meat, dairy (if using dairy-free alternatives), and plant-based proteins that might compete with the delicate uni taste.
The heavy cream can be swapped for coconut cream or cashew cream for a vegan version, though the texture will be slightly lighter. I’ve tested this with almond milk-based cream and found it works beautifully for those avoiding lactose. 🦀
Gluten-Free Certified
Uni sauce is naturally gluten-free, but always double-check your ingredients. The celery crown and fresh uni are inherently safe, while the white wine vinegar and olive oil are typically gluten-free.
The only potential concern is if you’re using a pre-mixed uni product with hidden additives—stick to fresh or high-quality pasteurized uni to avoid any risk. This sauce is perfect for gluten-sensitive diners or anyone following a gluten-free diet.
Low-Carb Adaptation
For a low-carb version, skip the celery crown entirely or replace it with thinly sliced cucumber or radish for a refreshing crunch. The sauce itself is already low in carbs, with only 2 grams net carbs per serving (without celery).
If you’re strict about carbs, use avocado oil instead of olive oil—it has slightly fewer carbs and adds a neutral base that won’t overpower the uni. The lemon and vinegar keep it bright and tangy without adding carbs. 🥑
Allergen Awareness
This recipe contains dairy (heavy cream) and seafood (uni), so it’s not safe for those with lactose intolerance or seafood allergies. For a dairy-free alternative, use coconut cream or silken tofu blended with water to mimic the cream’s texture.
If you’re avoiding seafood entirely, this sauce isn’t for you—but the technique can be adapted for avocado-based sauces or mushroom umami pastes with similar textures. Always label your dish clearly for guests with allergies.
Keto-Friendly Options
This uni sauce is already keto-friendly when made with the original ingredients, as it’s high in healthy fats and low in carbs. For an extra boost, add a pinch of garlic powder or smoked paprika to deepen the umami flavor without adding carbs.
The celery crown can be reduced to just 1 stem (about 1 gram net carbs) or omitted entirely for a zero-carb version. Pair it with keto-friendly seafood like shrimp, scallops, or grilled salmon for a meal under 5 grams net carbs per serving.
Nutrition facts
Frequently asked questions
What’s the best way to store leftover uni sauce?
Store in an airtight container with a thin layer of olive oil on top to preserve freshness. It keeps well in the fridge for 2 days or freeze in ice cube trays for up to 1 month. Always thaw gently in the fridge before reheating—never at room temperature.
Can I make this sauce without fresh uni?
Yes! Use pasteurized uni tubes from Japanese markets—they work almost as well, though the flavor will be slightly less vibrant. For a budget-friendly alternative, try high-quality sea urchin paste (check Asian grocery stores). The texture will be smoother but still delicious.
How do I prevent the sauce from separating?
Work quickly when adding the uni to warm (not hot) cream—overheating breaks the emulsion. If separation happens, gently whisk or re-warm the sauce on low heat for 30 seconds while stirring constantly. A splash of cold water can also help re-emulsify.
What’s the best seafood to pair with this sauce?
This sauce shines with delicate seafood like grilled halibut, chilled sushi-grade fish, or fresh oysters. It also elevates seared scallops or chilled soba noodles. The creamy texture and briny flavor make it a perfect match for anything that needs a luxurious finish.
Why does my celery crown turn mushy?
Cooking too long or using high heat causes celery to lose its crunch. Keep the heat at medium-low and cook for only 3-4 minutes until just golden at the edges. For extra crispiness, pat the slices dry before cooking and use a nonstick pan.