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The Ultimate Chilled Zucchini Soup with Lemon-Herb Chicken

When the summer heat is at its peak, the last thing you want is a heavy, hot meal. This is the time for elegant, refreshing, and sophisticated dishes that are bursting with fresh flavor. This incredible Chilled Zucchini Soup, topped with a zesty lemon-herb chicken salad and crispy homemade croutons, is the perfect summer meal.

This is your ultimate guide to creating a restaurant-quality chilled soup that is a complete and satisfying meal in a bowl. We’ll show you how to build a velvety, vibrant green soup base from tender zucchini and fresh herbs, then top it with savory rotisserie chicken and crunchy croutons. It’s a beautiful symphony of textures and temperatures.

What makes this recipe so special is its unexpected elegance and its celebration of fresh, seasonal ingredients. This isn’t just a simple soup; it’s a statement. This Chilled Zucchini Soup is the perfect main course for a sophisticated summer lunch, a light dinner on the patio, or an impressive first course for a dinner party.

Table of Contents

The Art of the Chilled Soup

Beyond gazpacho, the world of chilled soups is vast and delicious, and this Chilled Zucchini Soup is a perfect introduction. Unlike hot soups where flavors meld and deepen over a long simmer, chilled soups are all about showcasing the bright, fresh taste of the core ingredients.

The key to a great chilled soup is to season it boldly. Cold temperatures can slightly dull our perception of flavor, so it’s important to taste the finished, chilled soup and adjust the salt and acid (in our case, lemon juice) right before serving. The result should be vibrant, refreshing, and alive with flavor.

The Key Ingredients for Your Chilled Zucchini Soup

Each ingredient in this Chilled Zucchini Soup is chosen to build layers of fresh, summery flavor.

  • The Soup Base:
    • Zucchini: Fresh, in-season summer zucchini provides a beautiful green color and a subtle, sweet flavor.
    • Leeks: A member of the onion family, leeks have a much milder, sweeter flavor than regular onions, providing a delicate aromatic base for our soup.
    • Buttermilk: This is the secret to a creamy texture without the heaviness of cream. Its signature tang beautifully complements the fresh herbs and zucchini.
    • Fresh Dill & Parsley: We use a generous amount of fresh herbs, which are blended directly into the soup to create its vibrant green color and incredibly fresh, herbaceous flavor.
  • The Toppings:
    • Rotisserie Chicken: Using a store-bought rotisserie chicken is the ultimate shortcut for a savory, protein-packed topping.
    • Homemade Croutons: A simple but essential topping that adds a satisfying, crunchy texture to contrast the smooth soup.
    • Whole-Grain Mustard & Lemon: These create a quick, zesty dressing for the chicken salad topping, adding another layer of bright flavor.
Fresh ingredients for the Chilled Zucchini Soup
Fresh zucchini, leeks, and a bounty of fresh herbs are the key to this vibrant soup.

A Pro-Tip: How to Properly Clean Leeks

Leeks are grown in sandy soil and are notorious for trapping dirt and grit between their many layers. To clean them properly:

  1. Slice the leeks as directed in the recipe.
  2. Place the sliced leeks in a large bowl of cold water.
  3. Use your hands to swish them around vigorously. The dirt and sand will sink to the bottom of the bowl.
  4. Use a slotted spoon or your hands to lift the clean leeks out of the water, leaving the grit behind.

Step-by-Step Guide to Your Chilled Zucchini Soup

This elegant meal comes together in a few simple stages.

Part 1: Make and Chill the Soup

  1. Sauté the Aromatics: Heat 3 tablespoons of olive oil in a large pot or Dutch oven over medium-high heat. Add the cleaned and sliced leeks, season with salt, and cook, stirring, for 4 to 5 minutes until they are very soft.
  2. Cook the Zucchini: Add the chopped zucchini, bay leaves, and another pinch of salt. Cook, stirring, for about 2 minutes until the zucchini is coated in the oil. Add 4 cups of water, 1/2 teaspoon of salt, and a few grinds of pepper.
  3. Simmer: Bring the mixture to a boil, then reduce the heat and let it simmer for about 10 minutes, until the zucchini is very tender. Once cooked, remove and discard the bay leaves.
  4. Blend the Soup: Safety Tip: When blending hot liquids, never fill your blender more than halfway. Remove the small plastic insert in the blender lid and cover the opening with a folded kitchen towel. This allows steam to escape safely. Working in batches if necessary, transfer the zucchini mixture to a blender. Add the buttermilk, 1 cup of fresh dill, and 1/2 cup of fresh parsley. Puree until the soup is completely velvety smooth.
  5. Chill the Soup Quickly: Pour the pureed soup into a large metal bowl. Set this bowl inside a larger bowl filled with ice water. Let the soup sit, stirring it occasionally, until it has cooled down completely, about 10 minutes. This “ice bath” method is the fastest way to chill your Chilled Zucchini Soup. Once cool, taste and season with more salt if necessary.

Part 2: Prepare the Toppings

  1. Make the Homemade Croutons: While the soup is chilling, preheat your oven to 400°F. Toss the bread cubes with 1 tablespoon of olive oil and a pinch of salt. Spread them on a baking sheet and bake for 10 to 12 minutes, until they are golden brown and toasted.
  2. Make the Chicken Topping: In a medium bowl, combine the shredded rotisserie chicken, the remaining 2 tablespoons of olive oil, the finely grated lemon zest and juice, the whole-grain mustard, and 1 tablespoon each of chopped dill and parsley. Season with salt and pepper and toss everything together.

Part 3: Assemble and Serve

  1. Serve the Soup: Divide the Chilled Zucchini Soup among four shallow bowls.
  2. Add the Toppings: Place a generous mound of the lemon-herb chicken salad in the center of each bowl. Sprinkle the homemade croutons over the top.
  3. Garnish: Finish with a final sprinkle of the remaining chopped dill and parsley and serve immediately.
A spoonful of the finished Chilled Zucchini Soup with chicken and a crouton.
Every spoonful is a perfect combination of cool, creamy soup, savory chicken, and a crunchy crouton.
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The Ultimate Chilled Zucchini Soup with Lemon-Herb Chicken

A spoonful of the finished Chilled Zucchini Soup with chicken and a crouton.

A refreshing and elegant chilled soup perfect for summer. This recipe features a smooth, vibrant green soup made from simmering zucchini and leeks, which are then pureed with buttermilk, fresh dill, and parsley. The soup is rapidly chilled in an ice bath and served cold. It is topped with a flavorful rotisserie chicken salad dressed with lemon and mustard, as well as homemade toasted bread croutons, for a complete and satisfying meal.

  • Author: Evelyn
  • Prep Time: 20 minutes
  • Cook Time: 20 minutes
  • Total Time: 50 minutes (includes chilling time)
  • Yield: 4 servings 1x
  • Category: Soup
  • Method: Sautéing, Simmering, Blending, Baking
  • Cuisine: American

Ingredients

Scale
  • 6 tablespoons extra-virgin olive oil
  • 2 leeks (white and light green parts), halved lengthwise and cut into half-moons
  • Kosher salt
  • 1 1/2 pounds zucchini (2 to 3 medium), chopped
  • 2 bay leaves (preferably fresh)
  • Freshly ground pepper
  • 1/2 cup buttermilk
  • 1 cup fresh dill, plus 2 tablespoons chopped
  • 1/2 cup fresh parsley, plus 2 tablespoons chopped
  • 2 heaping cups cubed crusty white bread
  • 2 cups shredded rotisserie chicken, skin removed
  • 1/2 teaspoon finely grated lemon zest, plus 1 tablespoon juice
  • 1 tablespoon whole-grain mustard

Instructions

  1. Preheat the oven to 400°F.
  2. Make the Soup Base: Heat 3 tablespoons of olive oil in a large pot or Dutch oven over medium-high heat. Add the leeks, season with salt, and cook for 4-5 minutes, stirring, until very soft.
  3. Add the zucchini, bay leaves, and a pinch of salt. Cook for about 2 minutes, stirring to coat.
  4. Add 4 cups of water, 1/2 teaspoon of salt, and a few grinds of pepper. Bring the mixture to a boil, then reduce the heat and simmer for about 10 minutes, until the zucchini is very tender. Discard the bay leaves.
  5. Blend and Chill: Working in batches if necessary, transfer the zucchini mixture to a blender. Add the buttermilk, 1 cup of dill, and 1/2 cup of parsley, and puree until smooth.
  6. Pour the soup into a large metal bowl and set it in a larger bowl filled with ice water to create an ice bath. Let the soup sit, stirring occasionally, for about 10 minutes until cooled. Season with more salt if necessary.
  7. Make the Croutons and Chicken Topping: While the soup cools, toss the bread cubes with 1 tablespoon of olive oil and a pinch of salt. Spread them on a baking sheet and bake for 10-12 minutes, until toasted.
  8. In a separate bowl, combine the shredded chicken, the remaining 2 tablespoons of olive oil, the lemon zest, lemon juice, mustard, and 1 tablespoon each of chopped dill and parsley. Season with salt and pepper and toss to combine.
  9. Serve: Divide the chilled soup among four bowls. Top with the prepared chicken salad and the toasted croutons. Sprinkle with the remaining chopped dill and parsley.

Notes

  • Using an ice bath is a quick and effective way to chill the soup without having to wait for hours for it to cool in the refrigerator.
  • This recipe is a great way to use up leftover rotisserie chicken.
  • The croutons are made fresh for the best texture and flavor.

Nutrition

  • Serving Size: 1/4 of recipe
  • Calories: 600-700
  • Sugar: 10-15 g
  • Sodium: 900-1200 mg
  • Fat: 35-45 g
  • Saturated Fat: 6-9 g
  • Trans Fat: 0 g
  • Carbohydrates: 30-40 g
  • Fiber: 6-8 g
  • Protein: 30-35 g
  • Cholesterol: 80-100 mg

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Conclusion: A Taste of Summer Elegance

This Chilled Zucchini Soup is a perfect celebration of fresh, seasonal flavors. It’s a sophisticated, beautiful, and incredibly delicious meal that is light enough for a hot day but hearty enough to be truly satisfying. This recipe proves that simple, elegant cooking can be both easy and spectacular. Enjoy this refreshing taste of summer.

Frequently Asked Questions (FAQs)

My soup tastes a little bland. What should I do?

Cold dishes often need more seasoning than warm dishes, as cold temperatures can dull flavor. The most likely culprit is not enough salt. After your Chilled Zucchini Soup is completely cool, be sure to taste it one last time and add another generous pinch of salt and a fresh squeeze of lemon juice to make the flavors pop.

Can I make this soup ahead of time?

Yes, this is a perfect make-ahead dish! You can make the soup and the chicken topping up to 2 days in advance and store them in separate airtight containers in the refrigerator. For the best texture, it’s best to make the croutons closer to serving time so they stay nice and crunchy.

How can I make a vegetarian or vegan version?

a vegetarian version: Simply omit the chicken topping. The soup is still a lovely first course or light meal on its own.
For a vegan version: Omit the chicken, and substitute the buttermilk with a plain, unsweetened dairy-free yogurt or a can of full-fat coconut milk.