Roasted Cauliflower Soup
Ingredients
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- 2 pounds cauliflower – cut into florets
- 4 tbsp extra-virgin olive oil – divided
- 1 1/4 tsp kosher salt – divided
- 1/2 tsp black pepper – divided
- 1 medium yellow onion – chopped
- 3 cloves garlic – sliced
- 4 sprigs thyme
- 1 leaf bay leaf
- 4 cups vegetable broth
- 1/2 cups heavy cream
- 1 tbsp lemon juice
- chives – finely sliced (for serving)
Instructions
1. Heat the oven to 425°F. Line a rimmed baking sheet with parchment for easy cleanup and set a medium soup pot nearby.
2. On the baking sheet, toss the cauliflower with 2 tbsp extra-virgin olive oil, kosher salt, and black pepper; reserve the remaining 2 tbsp oil for the pot. Spread in an even layer and roast until deeply browned at the edges and tender, 25–30 minutes, turning once; set aside a few browned florets for garnish.
3. Warm the reserved oil in the soup pot over medium heat. Add the yellow onion and garlic and cook, stirring, until translucent and sweet, 5–7 minutes. Add the thyme and bay leaf and cook 1 minute until fragrant.
4. Pour in the vegetable broth and bring to a simmer. Add the roasted cauliflower (except the reserved garnish) and simmer gently, 10–15 minutes, until the flavors meld and the stalk pieces are very soft.
5. Remove the thyme and bay leaf. Blend the soup until completely smooth and silky, using an immersion blender in the pot or a countertop blender in batches; return to the pot if needed. Stir in the heavy cream and lemon juice, then taste and adjust seasoning as needed; adjust consistency with a little hot soup if you prefer it thinner and warm through, 1–2 minutes.
6. Ladle into warm bowls, top with the reserved roasted florets and chives, and serve hot.
Roasted Cauliflower Soup is a velvety, gently sweet soup with nutty depth from oven-caramelized cauliflower. The roasting step concentrates flavor and adds a toasty aroma that blends beautifully with soft onion, garlic, and a touch of cream. The result is a smooth, comforting bowl that feels elegant yet weeknight-friendly, with a clean finish brightened by a hint of lemon.
Cauliflower soups have long roots across Europe and North America, evolving from simple purées of brassicas and stock into today’s roasted versions. As home ovens became common and roasting vegetables gained popularity, cooks discovered how browning cauliflower transformed the soup’s character. Modern renditions often keep the ingredient list minimal to let the roasted cauliflower lead, finishing with fresh herbs or chives for contrast.