Cold Lemon Soup with Zucchini

This is avgolemono gone cold for summer. Eggs beaten until thick and frothy get tempered with fresh lemon juice, then stirred into hot chicken broth to create a silky, tangy soup that’s served completely chilled. Julienned zucchini added just before serving gives it a crisp, green freshness.

The tempering technique is what separates a smooth soup from scrambled egg disaster. Beat the eggs until they’re genuinely thick and frothy, then add the lemon juice slowly while still beating. This stabilizes the eggs so they can handle the hot broth without curdling. Pour the egg-lemon mixture into the broth in a thin stream, stirring constantly.

Blanching the zucchini for exactly 45 seconds is a precise move. It’s just enough heat to set the bright green color and take the raw edge off without cooking it soft. The immediate ice-water bath stops the cooking and locks in that crunch. Mixed into the cold soup right before serving, the zucchini stays firm and fresh.

Kitchen Tips

• The eggs must be thick and frothy before adding the lemon juice. Under-beaten eggs won’t emulsify properly and you’ll get a thin, watery soup.
• Add the lemon juice to the eggs, not the other way around. The acid helps stabilize the eggs before they hit the hot broth.
• Cool the soup to room temperature before refrigerating. Putting hot egg-based soup directly in the fridge can cause it to separate.
• Garnish with paper-thin lemon slices floated on top of each bowl.

Variations

• Add a handful of cooked orzo or rice to the chilled soup for a heartier version.
• Swap zucchini for blanched asparagus tips or fresh cucumber for a different vegetable texture.
• Stir in a tablespoon of fresh dill or mint right before serving for an herbal lift.