Arigatos White Sauce Recipe: Celery Crown Crunch Over Tangy Dill Cream

This Arigatos white sauce recipe transforms ordinary dishes into something extraordinary with its velvety texture and bright, tangy flavor profile. The secret lies in balancing creamy richness with fresh dill and celery crown crunch, creating a sauce that elevates everything from pasta to seafood.

I developed this recipe after years of experimenting with fusion techniques, and it consistently delivers restaurant-quality results at home.

The foundation of this sauce is a classic roux—equal parts butter and flour cooked until golden—then deglazed with milk and cream for a silky consistency. What sets it apart is the addition of fresh dill and finely chopped celery crown, which add a bright, herbal note and satisfying crunch.

The sauce is versatile enough for weeknight dinners but refined enough for special occasions.

What you'll end up with is a tangy, creamy sauce that coats every bite perfectly, whether drizzled over grilled fish, tossed with noodles, or used as a dip. The celery crown adds a delightful textural contrast, while the dill brings a fresh, garden-fresh brightness.

This sauce keeps well in the refrigerator for up to five days, making it a perfect make-ahead option for busy cooks.

Ready in just 15 minutes, this recipe requires minimal effort but delivers maximum flavor. The key is patience during the roux development and proper whisking to avoid lumps. Once you try this sauce, you'll never go back to store-bought versions again.

Ingredients for arigatos white sauce

Nine simple ingredients transform into a restaurant-worthy sauce with velvety texture and bright, tangy flavor.

The butter and flour are your foundation—use European-style butter if you want extra richness, but any unsalted works. Trader Joe's has great pre-sifted flour, but sifting yourself ensures a smoother sauce. Fresh dill is non-negotiable here; dried just won't cut it. Look for bright green stems at the grocery store—avoid wilted or yellowing leaves. Celery crowns add that signature crunch, but if you can't find them, substitute finely chopped celery leaves (they're milder but still work). The garlic? Freshly minced makes all the difference—pre-minced from jars lacks flavor.

No heavy cream? Full-fat coconut milk works in a pinch, though the flavor will differ slightly. Running short on fresh dill? Dried dill at one-third the amount gets you close, but it won't have that bright, fresh note. The celery crowns can be swapped for finely chopped parsley if needed, though the texture will be softer. Lemon juice is key for that tangy brightness—freshly squeezed is best, but bottled works if you're in a hurry. Salt is your friend here; taste as you go and adjust. The pepper should be freshly ground—pre-ground loses potency fast.

This sauce keeps beautifully—cover with plastic wrap pressed directly on the surface to prevent a skin from forming. Good for up to 5 days in the fridge, though it tastes best within the first 2-3. Freezes for 3 months if you want to make a big batch ahead of time. I like to portion it into small jars so I can grab just what I need for a quick pasta dinner or seafood dish. The celery crowns stay crisp for about 2 days in the fridge, so use those first if you're storing leftovers.

Step-by-step instructions for Arigatos white sauce

This creamy yet textured sauce delivers perfect balance—crisp celery crowns over velvety dill-infused cream.

In a medium saucepan, melt the 0.5 cup unsalted butter over medium-low heat. Once fully melted but not browned, whisk in the 0.5 cup all-purpose flour all at once. Cook for 2-3 minutes, stirring constantly with a wooden spoon, until the mixture forms a smooth, pale golden roux with no raw flour taste.

This is your flavor anchor—don't rush it. The roux should smell nutty and toasty but never darken. If it starts to brown too quickly, reduce the heat immediately. You're building the base that will emulsify with your dairy later, so proper development here prevents future lumps.

Slowly pour in the 1 cup whole milk while whisking vigorously to prevent lumps. Return heat to medium and cook for 3-4 minutes until the mixture thickens slightly. Then, gradually whisk in the 0.5 cup heavy whipping cream and continue cooking for another 2 minutes until the sauce coats the back of a spoon.

Here's where technique matters: add liquids gradually and whisk continuously. If you pour too quickly, you'll create streaks. If you stop whisking, you risk breaking the emulsion. The sauce should be silky but not gluey at this stage—it'll thicken more as it cools.

Reduce heat to low and stir in the 2 minced garlic cloves, 0.5 tsp diamond crystal kosher salt, and 0.25 tsp freshly ground black pepper. Cook for 1 minute until fragrant. Remove from heat and stir in the 1 tbsp lemon juice and 0.33 cup finely chopped fresh dill. Let the mixture steep for 5 minutes off the heat.

The lemon juice brightens the richness while the dill infuses its signature herbal notes. This resting period allows all flavors to meld—don't skip it. The sauce should smell vibrant and complex, with a tangy-sweet aroma from the lemon and fresh dill.

In a small bowl, combine the 0.25 cup finely minced celery crowns with 1 tablespoon of the finished sauce to create a slurry. Slowly whisk this mixture back into the main saucepan while heating on low for 1-2 minutes just until warmed through. The celery should remain crisp—don't overcook.

This is the signature element that sets this sauce apart. The celery adds a delightful textural contrast against the creamy base. If the celery starts to soften too much, remove the pan from heat immediately. The sauce should be thick enough to coat the back of a spoon but still flow smoothly.

Taste and adjust seasoning—add more salt if needed, or a splash of lemon juice for brightness. For best results, use immediately over grilled fish, chicken, or vegetables. If storing, transfer to an airtight container and refrigerate for up to 3 days, reheating gently on low heat while stirring constantly to prevent separation.

The sauce should be velvety with visible dill flecks and crisp celery pieces that pop between your teeth. Each spoonful should deliver a perfect balance of creaminess, herbal freshness, and subtle tang. This sauce transforms simple proteins into restaurant-quality dishes with minimal effort.

Creative variations of these flavors

Japanese Fusion Twist

This sauce draws inspiration from Japanese arigato (thank you) culture by incorporating umeboshi vinegar—just 1 teaspoon added with the lemon juice—for a subtle sweet-tart depth. The celery crowns mimic the texture of beni shoga (pickled ginger) without the heat, creating a familiar yet fresh profile.

For extra umami, stir in ½ teaspoon soy sauce at the finish. 🌿

Herb Variations

Swap dill for ½ cup finely chopped chives and 1 tablespoon chopped parsley> for a lighter, more delicate flavor—perfect for seafood. Or try ½ cup chopped cilantro> and ½ teaspoon lime zest> for a Latin-inspired twist that pairs beautifully with grilled shrimp.