Avgolemono Soup Recipe America's Test Kitchen: Bright Lemon-Egg Velouté With Crisp Celery Crowns

This America's Test Kitchen avgolemono soup recipe delivers the perfect balance of bright lemon and velvety egg sauce, elevated by crisp celery crowns that add texture and freshness.

The secret lies in tempering eggs with hot broth to prevent curdling, creating a silky sauce that transforms simple ingredients into something extraordinary. I've perfected this technique over countless batches, ensuring every spoonful is rich, tangy, and impossibly smooth.

The foundation begins with a flavorful chicken broth, simmered with aromatic vegetables until deeply infused. Then comes the magic: whisking eggs and lemon juice into the hot broth in a precise ratio, allowing the heat to gently cook the eggs into a luscious velouté without breaking.

This method guarantees a sauce that's creamy yet light, with a bright citrus tang that cuts through the richness. The crisp celery crowns, fried to golden perfection, add a satisfying crunch that contrasts beautifully with the soup's velvety texture.

What sets this recipe apart is the attention to detail that prevents common pitfalls—like curdled eggs or overly thick soup. By tempering the eggs gradually and incorporating them slowly, you'll achieve a velouté that's restaurant-quality at home.

The result is a bowl of soup that's comforting yet refreshing, with layers of flavor that dance on your palate. Each component comes together seamlessly, making this a dish that's both impressive and foolproof.

Serve this avgolemono soup with a sprinkle of fresh herbs, a drizzle of olive oil, and those crisp celery crowns on top for an elegant yet approachable meal. It's perfect for chilly evenings, special gatherings, or whenever you crave a soup that feels like a warm hug in a bowl.

Let's get started on creating this timeless classic.

Ingredients for avgolemono soup recipe america's test kitchen

Six cups of aromatic broth, velvety egg yolks, and crisp celery crowns transform simple pantry staples into America's Test Kitchen's signature avgolemono.

The broth is the soul of this soup—homemade is ideal, but Kitchen Basics or Pacific Foods brands deliver consistent quality. Look for deep golden color and rich aroma; anything cloudy or pale lacks depth. Shallots and garlic should be freshly minced (pre-minced loses potency), and the dill needs to be vibrant green—no wilted stems. For the celery crowns, select thick stalks (1.5 inches or wider) to ensure crispness after frying. If using store-bought broth, opt for low-sodium varieties to control seasoning precision.

No fresh dill? Dried dill at one-third the amount works, but the flavor profile shifts slightly. Substituting lemon juice? Key lime juice adds complexity, but adjust to taste—it's more acidic. For the eggs, separate yolks from whites carefully; even a trace of white can cause curdling. If you're concerned about curdling, temper the eggs first by whisking them into a small bowl of warm broth before incorporating into the main pot. The celery crowns can be prepped ahead and fried just before serving—store them in a single layer on paper towels to maintain crispness.

Broth and aromatics keep 3 days refrigerated or 3 months frozen in airtight containers. The egg-lemon mixture must be used immediately—never pre-mix as it thickens rapidly. Celery crowns lose crispness within 1 hour of frying, so prepare them last. For meal prep, assemble soup components separately: store broth and aromatics together, egg mixture separately, and fry crowns fresh. Reheat broth gently before combining with eggs to maintain silky texture.

Step-by-step instructions for avgolemono soup with crisp celery crowns

A delicate balance of technique transforms simple ingredients into a velvety lemon-egg soup with crisp celery accents.

Cut the 2 whole celery stalks crosswise into 1-inch thick slices. Pat each slice dry with paper towels to remove all moisture—this ensures crispness when fried. Heat 0.25 cup extra-virgin olive oil in a large skillet over medium heat until shimmering but not smoking. Working in batches, fry the celery slices for 2-3 minutes per side until deep golden brown and crisp. Transfer to a paper towel-lined plate to drain excess oil. Keep warm until serving.

Real talk: Don't skip the drying step. Any moisture will cause the celery to steam instead of crisp. If you hear sizzling that slows down, your oil isn't hot enough—let it recover before adding more celery.

In the same skillet (no need to clean it—the fond adds flavor), melt 2 tablespoons unsalted butter over medium heat. Add the 2 whole shallots and 3 cloves garlic, mincing them directly in the pan. Cook for 5-6 minutes until the shallots soften and turn translucent, stirring occasionally. Add 1 tablespoon all-purpose flour and cook for another 1 minute, stirring constantly to create a light roux.

This step develops the soup's depth. The roux will remove any lingering moisture from the celery crowns while providing body. If the mixture darkens too quickly, reduce the heat slightly—you want nutty, not burnt, flavor.

Slowly pour in the 6 cups chicken broth while whisking continuously to prevent lumps. Bring to a gentle simmer and cook for 10 minutes until slightly reduced and fragrant. Season with 1.5 teaspoons salt and 0.25 teaspoon white pepper. Remove from heat and stir in 0.25 cup fresh dill and 0.25 cup fresh lemon juice. The soup should be smooth with a bright, citrusy aroma.

Taste the broth before proceeding—this is your flavor checkpoint. The acidity from the lemon should be balanced by the savory broth, with just a hint of dill's herbal brightness. If it needs more acid, add another 1 teaspoon lemon juice; if it needs salt, adjust now before adding the eggs.

In a separate bowl, whisk the 4 whole large egg yolks until smooth. Ladle 1 cup of the hot broth into the yolks while whisking vigorously to temper them. The mixture should reach 160°F—hot enough to cook the eggs but not so hot it curdles them. Gradually pour the tempered egg mixture back into the main pot, whisking constantly for 2-3 minutes until the soup thickens slightly and becomes glossy.

This is the moment that matters: The eggs must be incorporated slowly to prevent scrambling. If the soup looks too thin, whisk in 1 tablespoon additional broth at a time until you reach a velvety consistency. Remove from heat immediately after emulsification.

Strain the soup through a fine-mesh sieve into a clean pot to remove any lumps. Return to low heat and stir in 2 tablespoons unsalted butter, cutting it into small pieces as it melts. The soup should coat the back of a spoon but remain pourable. Taste and adjust seasoning—you may need a pinch more salt or lemon juice to balance flavors.

Ladle the soup into bowls, garnishing each serving with 2 crisp celery crowns and 1 tablespoon chopped fresh parsley. Serve immediately while the celery remains crisp and the eggs maintain their silky texture. The contrast of warm soup, cool celery, and bright lemon creates a restaurant-worthy experience.

Essential equipment for great avgolemono soup recipe america's test kitchen

Skillet Essentials

Your 10-inch cast iron skillet is the MVP for crisp celery crowns and aromatic base—it retains heat evenly and develops deep fond flavors. I swear by a Lodge Pre-Seasoned Cast Iron Skillet for its durable seasoning and even heat distribution.

For budget-friendly alternatives, a stainless steel skillet works well, but cast iron gives that perfect Maillard reaction for golden celery. 🔥

Whisking Tools

A balloon whisk is non-negotiable for tempering eggs and emulsifying the sauce—its wide head incorporates air and blends smoothly. I use a OXO Good Grips Balloon Whisk because the silicone handles stay cool and the wire loops are sturdy.

For smaller batches, a French whisk works, but balloon whisks handle larger volumes better without splattering.

Fine-Mesh Sieve

Straining the soup through a fine-mesh sieve removes any lumps for that silky texture. My go-to is a Microplane Food Mill—it's gentle on delicate sauces and catches even the finest particles.

Avoid plastic sieves; they can melt under hot broth. A stainless steel chinois is another great option if you prefer a more professional tool.

Thermometer Precision

An instant-read thermometer ensures your broth reaches 160°F when tempering eggs—critical for preventing curdling. I rely on a Thermoworks Thermapen ONE for its lightning-fast readings and durable probe. For budget-conscious cooks, a Taylor Precision Digital Thermometer delivers reliable accuracy without breaking the bank.

Broth Storage Containers

Store your aromatic broth in glass airtight containers like Le Parfait Glass Storage Containers—they preserve flavors better than plastic and reheat evenly. For freezing, use quart-sized silicone molds to portion broth into single servings.

Label containers with dates to track freshness, as homemade broth peaks within 3 days refrigerated or 3 months frozen. ❄️

Garnish Essentials

Fresh herbs and celery crowns elevate presentation. Keep celery crowns crisp by frying them fresh and storing in a single layer on paper towels between servings. For herbs, I chop parsley and dill with a Victorinox Swiss Classic 8-inch Chef's Knife—its sharp edge ensures clean cuts.

A small offset spatula helps transfer crisp crowns to bowls without crushing them.

Frequently asked questions