If you think you know fennel, this soup will make you think again! While raw fennel is crisp with a bold anise bite, cooking transforms it into something magical—mellow, sweet, and unbelievably delicate. This recipe celebrates that beautiful transformation, blending it with potato for body and a touch of sour cream for a luxurious, tangy finish. The result is a silky-smooth, elegant soup that’s pure comfort in a bowl. It’s the perfect way to warm up on a cool evening or to serve as a sophisticated starter for a dinner party.
Ingredients
• 3 large fennel bulbs, about 3 lbs / 1.3 kg with stalks
• 5 tbsp / 70g butter, divided
• 1 medium onion, diced
• 1 large potato, peeled and diced
• 3 cups / 720 ml Vegetable Stock
• 1/2 tsp / 2.5g salt
• Freshly ground black pepper, to taste
• 1/2 cup / 120 ml milk
• 1 cup / 240g sour cream
Instructions
1. Prep the Fennel: Trim the long stalks from the fennel bulbs. Finely chop a few of the feathery fronds and set them aside for garnish. Cut the tough root end off each bulb, then quarter them and slice the quarters into 1/2-inch thick pieces. You should have about 8 to 9 cups of sliced fennel.2. Build the Flavor Base: In a large stockpot or Dutch oven, melt 3 tablespoons of the butter over medium heat. Add the diced onion and sauté for 5 minutes until softened and translucent. Add the sliced fennel and diced potato, stirring often, and continue to sauté for another 5 minutes.3. Simmer to Softness: Pour in the vegetable stock, salt, and a generous amount of freshly ground pepper. Increase the heat to bring the soup to a boil. Once boiling, reduce the heat to low, cover the pot, and let it simmer for 20 to 30 minutes, or until the fennel and potato are very tender when pierced with a fork.4. Create the Silky Texture: Carefully transfer the soup to a blender or use an immersion blender to purée until completely smooth. For an extra-velvety finish, pour the puréed soup through a medium-mesh sieve back into a clean saucepan, pressing on the solids to extract all the liquid.5. Finish and Serve: Gently heat the strained soup over low heat. Stir in the remaining 2 tablespoons of butter until melted, then stir in the milk. Remove from the heat and whisk in the sour cream until fully blended and the soup is creamy. Taste and adjust the salt and pepper as needed. Serve immediately, garnished with the reserved fennel fronds.
Nutritional Information
• (Approximate)
• Servings: 4
• Calories: 455 kcal
• Protein: 8g
• Fat: 35g
• Carbohydrates: 28g
• Disclaimer: is an estimate and can vary depending on the specific used.
Pro Tips
• for the Perfect Fennel Soup
• For an ultra-silky, restaurant-quality texture, do not skip the step of passing the puréed soup through a sieve. It makes a world of difference!
• To make this soup vegan, use a high-quality plant-based butter, full-fat oat milk, and a vegan sour cream alternative or a rich cashew cream.
• Don’t discard your leftover fennel fronds! Store them in a plastic bag in the refrigerator and chop them into salads or use them as a garnish for other dishes for a fresh, anise-like flavor.
• The potato is a natural thickener. For a slightly thinner consistency, you can use a smaller potato or add an extra splash of vegetable stock before blending.
FAQ
Q: Can I make this creamy fennel soup vegan
A: Absolutely! To make this recipe vegan, simply substitute the dairy components. Use a high-quality plant-based butter, a rich full-fat oat milk instead of dairy milk, and a vegan sour cream alternative. For an extra creamy finish, you could also use a homemade cashew cream in place of the sour cream.
Q: How do I store leftover fennel soup
A: You can store leftover fennel soup in an airtight container in the refrigerator for up to 3-4 days. To reheat, warm it gently on the stovetop over low heat, stirring occasionally, until heated through. Avoid boiling it, as this can affect the texture of the sour cream.
Q: What can I serve with this vegetarian fennel soup to make it a full meal
A: This soup pairs beautifully with crusty bread or a gourmet grilled cheese sandwich for a simple, satisfying meal. For something more substantial, serve it alongside a hearty salad with chickpeas and a lemon vinaigrette, or with a simple quinoa or farro side dish to add extra protein and fiber.
Q: Is there a substitute for sour cream in this recipe
A: Yes, if you don’t have sour cream, you can use full-fat Greek yogurt for a similar tangy creaminess. Crème fraîche is another excellent, though richer, alternative. For a non-dairy option that isn’t strictly vegan (if you’re still using butter/milk), a swirl of full-fat coconut cream can also work, though it will add a subtle coconut flavor.
