Silky Apple and Celery Root Soup
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A bowl of Silky Apple and Celery Root Soup is pure comfort on a cool day. It is smooth, gently sweet, and savory, with a fresh herbal note from thyme. I love how it feels special enough to serve to guests yet simple enough to make for an ordinary weeknight.
This soup brings together sweet apples, earthy celeriac, onion, thyme, and vegetable stock. Almond milk adds a soft, creamy finish without dairy, while chopped walnuts bring a pleasant crunch on top. Together, these ingredients make a balanced soup with a mellow flavor that lets both the apples and celery root shine.
The method is easy: soften the onion, simmer the apples and celeriac in stock, then blend everything until smooth. After that, stir in more stock and almond milk, warm the soup, and finish each bowl with thyme and walnuts. It takes about 5 minutes to prepare and 25 minutes to cook, so you can have six servings ready in about 30 minutes.
Serve Silky Apple and Celery Root Soup for a cozy family dinner, a light lunch, or a comforting first course at a holiday meal. It is especially welcome on chilly nights, and it pairs well with simple bread or a crisp salad.
Why You’ll Love This Silky Apple and Celery Root Soup
- Quick and practical: This soup takes about 30 minutes from start to finish, with little hands-on work.
- Made with simple ingredients: Apples, celeriac, onion, thyme, and vegetable stock turn into a flavorful meal without a long shopping list.
- Smooth and comforting: Once blended, the soup has a silky texture and a gentle, creamy feel.
- Easy to adjust: You can change the herbs, stock, or non-dairy milk to suit what you have at home.
- A lovely make-ahead option: Prepare it in advance, chill it, and warm it gently when you are ready to serve.
Celeriac Tips
Choose a medium celeriac that feels firm and heavy for its size, without soft spots or signs of drying. Its rough, knobby skin can look intimidating, but the inside is crisp and mild, with a flavor that suggests celery and parsley. To prepare it, trim away the top and bottom so it sits steadily on your cutting board. Then use a sturdy knife or vegetable peeler to remove the thick skin, including the creases where dirt may collect. Cut the peeled root into evenly sized cubes so they cook at the same rate. If you prepare it ahead, keep the cubes covered in cold water with a little lemon juice to help prevent browning, then drain them before cooking.
Options for Substitutions
- Change the apples: Use a crisp, sweet-tart variety such as Honeycrisp, Fuji, or Gala. A tart apple, such as Granny Smith, will give the soup a sharper flavor.
- Swap the thyme: Try fresh sage or rosemary for a deeper, woodsy note. Start with a small amount, then taste before adding more.
- Choose another stock: Vegetable stock keeps the recipe vegetarian. You can use low-sodium chicken stock if you do not need a vegetarian soup.
- Use another non-dairy milk: Unsweetened oat milk or soy milk can stand in for almond milk. Choose an unflavored, unsweetened option so it does not make the soup taste sweet.
- Use dairy milk or cream: For a non-vegan version, use regular milk or a small splash of cream instead of non-dairy milk. Add it near the end and avoid a hard boil.
- Change the garnish: Replace walnuts with toasted pecans or pumpkin seeds, or leave them off for a nut-free bowl. You can also add a few thyme leaves for a simple finish.
Watch Out for These Mistakes
First, do not rush the onion. Cook it over medium heat until soft and translucent, rather than letting it brown. If it browns too much, its stronger, sweeter flavor can compete with the apple and celeriac.
Next, make sure the celeriac is tender before blending. The exact time can vary depending on the size of the cubes, so test a piece with a fork. If it still feels firm in the middle, simmer the soup a little longer. Otherwise, the finished texture may be grainy rather than silky.
Also, blend carefully. Hot soup can splatter, so follow your blender’s instructions for hot liquids. If using a countertop blender, work in small batches and leave room for steam to escape. An immersion blender is convenient, but keep its blade fully under the surface to reduce splashing.
Finally, add the almond milk and remaining stock after blending, as directed. Then warm the soup gently and taste before serving. Vegetable stocks vary in saltiness, so add more salt only after you have checked the flavor. If the soup gets too thick, loosen it with a little extra stock or water.
What to Serve With Silky Apple and Celery Root Soup?
Silky Apple and Celery Root Soup is lovely with a slice of crusty sourdough or warm whole-grain bread for dipping. For a fuller meal, serve it with a grilled cheese sandwich, a simple green salad with a tangy vinaigrette, or roasted vegetables such as carrots and Brussels sprouts. The soup’s gentle sweetness pairs especially well with crisp, savory sides, so keep the accompaniments simple and fresh.
Storage Instructions
Store: Let the soup cool, then transfer it to an airtight container and refrigerate it for up to 3 to 4 days. Keep the walnuts separate and add them just before serving so they stay crisp.
Freeze: Freeze the cooled soup in a freezer-safe container for up to 3 months. Leave a little space at the top because liquid expands as it freezes. If possible, freeze the soup before adding the almond milk for the best texture. Thaw it in the refrigerator overnight, then stir in the milk as you reheat it.
Reheat: Warm the soup in a saucepan over low to medium-low heat, stirring often. Do not let it boil hard, especially after adding non-dairy milk. For the microwave, heat a serving in a microwave-safe bowl in short intervals, stirring between each one. Add a splash of stock or water if the soup has thickened, then garnish with walnuts and thyme.
Recipe Info
- Preparation Time: 5 minutes
- Cooking Time: 25 minutes
- Total Time: 30 minutes
- Level of Difficulty: Easy
- Servings: 6
- Calories: 139 kcal per serving
Estimated Nutrition
Estimated nutrition for the whole recipe (without optional ingredients):
- Calories: About 780 to 900 kcal
- Protein: About 12 to 18 g
- Fat: About 30 to 42 g
- Carbohydrates: About 120 to 145 g
These are approximate values for the full recipe, not per serving. Actual nutrition can vary based on the size and variety of the apples, the brand of vegetable stock, and which non-dairy milk you use. The listed recipe estimate is 139 kcal per serving.
Ingredients
- 1 onion, diced
- 1 tablespoon olive oil
- 2 large or 3 small apples, peeled, cored and cubed
- 1 medium celeriac (celery root), peeled and cubed
- 1 teaspoon thyme
- 1/4 teaspoon salt
- 3 cups vegetable stock, divided (2 cups for simmering, 1 cup added later)
- 1 cup almond milk or other non-dairy milk
- For the garnish:
- 2 tablespoons roughly chopped walnuts
- 1/2 tablespoon thyme
Step-by-Step Instructions
Step 1: Soften the Onion
Warm the olive oil in a soup pot over medium heat. Add the diced onion and cook, stirring now and then, until it softens. This usually takes a few minutes. Keep the heat moderate so the onion turns tender without browning.
Step 2: Simmer the Apples and Celeriac
Add the cubed apples and celeriac to the pot. Stir in the thyme, salt, and 2 cups of vegetable stock. Bring the mixture to a gentle simmer, then cover the pot partly and cook until the celeriac is tender when pierced with a fork. Stir occasionally so the pieces cook evenly.
Step 3: Blend Until Smooth
Take the pot off the heat before blending. Use an immersion blender to puree the soup right in the pot, or carefully transfer it to a countertop blender in batches. Blend until the soup looks completely smooth. If using a countertop blender, take care with the hot liquid and let steam escape according to the manufacturer’s directions.
Step 4: Add the Remaining Stock and Milk
Return the puree to the pot if needed. Stir in the remaining 1 cup of vegetable stock and the almond milk. Warm the soup until it reaches a boil, stirring often. For a creamier flavor, use an unsweetened non-dairy milk. If the soup seems too thick, add a little more stock or water.
Step 5: Taste and Serve
Taste the soup and adjust the seasoning. Add a little more salt if needed, keeping in mind that some vegetable stocks are already salty. Ladle the warm soup into bowls.
Step 6: Make the Walnut-Thyme Garnish
Mix the roughly chopped walnuts with the thyme. Scatter the mixture over each bowl just before serving. This final touch adds crunch and a fresh herbal aroma to the silky soup.
Conclusion
Silky Apple and Celery Root Soup is an easy, cozy recipe made with apples, celeriac, thyme, and vegetable stock. Blend it smooth, stir in almond milk for a gentle creamy finish, and top each bowl with walnuts and thyme. Since it takes about 30 minutes and makes six servings, it works just as well for a weeknight supper as it does for a special lunch.
Give this comforting soup a try the next time you find celeriac at the store. If you make it, share how it turned out and tell us which apple or milk you used. Then explore more easy soup recipes for another simple, warming meal.
Silky Apple and Celery Root Soup
Ingredients
Method
- Warm the olive oil in a soup pot over medium heat. Add the diced onion and cook until soft without browning.
- Add the cubed apples, celeriac, thyme, salt, and 2 cups of vegetable stock. Bring to a gentle simmer and cover partly.
- Cook until the celeriac is tender, stirring occasionally.
- Blend the soup until smooth, either with an immersion blender or by transferring it to a countertop blender in batches.
- Stir in the remaining 1 cup of vegetable stock and the almond milk. Warm the soup gently until it reaches a boil.
- Taste and adjust seasoning if needed.
- Ladle the warm soup into bowls and garnish with the walnut-thyme mixture.
