Cauliflower Soup with Chive Oil and Rye Crostini
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 28 Jan 2026
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This roasted cauliflower soup is a beautifully refined vegetarian dish that elevates simple ingredients into a sophisticated meal. By roasting the cauliflower whole before simmering, you unlock a deep, nutty sweetness that creates a far superior depth of flavour compared to traditional boiled versions. The addition of a vibrant, homemade green chive oil and crisp rye crostini provides a wonderful contrast in both texture and colour, making this recipe a feast for the senses.
Ideal as an elegant starter for a dinner party or a comforting weekend lunch, this silky soup feels incredibly indulgent thanks to the addition of double cream and a generous whisk of butter. High in fibre and naturally nourishing, it is a healthy yet luxurious way to enjoy seasonal vegetables. Prepare the chive oil in advance to save time and give your kitchen a professional touch with very little effort.
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Ingredients for Cauliflower Soup with Chive Oil and Rye Crostini
60g bunches chives
Kosher salt
3/4 cup plus 1 tablespoon olive oil
8 thin slices cut from Finnish rye bread (for crostini) or 4 slices pumpernickel bread, cut into 1/3" cubes (for croutons)
2 sprigs rosemary
1 large head of cauliflower (about 900g ), leaves discarded
12 tablespoons (1 1/2 sticks) unsalted butter, softened, divided
Kosher salt
1 large onion, minced
60ml double cream
How to make Cauliflower Soup with Chive Oil and Rye Crostini
Back to contentsSet a coffee filter in a glass; set aside. Blanch chives for 10 seconds in a medium saucepan of boiling salted water. Transfer to a medium bowl of ice water to cool. Squeeze chives dry; coarsely chop and place in a blender. Add 180ml oil; purée until smooth. Pour through coffee filter; let drain for 3 hours at room temperature, or overnight in refrigerator (do not press on solids). DO AHEAD: Can be made 1 week ahead. Cover; chill. Bring to room temperature before using.
Preheat oven to 204°C. Line a rimmed baking sheet with parchment paper. Brush bread slices (or toss bread cubes) with 1 tablespoon olive oil; toss with rosemary sprigs. Transfer to prepared sheet; bake until crisp, about 12 minutes. Let cool completely. Discard rosemary sprigs. DO AHEAD: Can be made 1 day ahead. Store airtight at room temperature.
Preheat oven to 177°C. Place whole cauliflower head in a large baking dish, rub with 4 tablespoons butter, and season with salt. Add 120ml water to dish. Bake uncovered, tenting with foil if cauliflower begins to brown, until a knife inserted into the core meets no resistance, about 1 1/2 hours. Remove cauliflower from oven; let cool. Coarsely chop and set aside.
Melt 2 tablespoons butter in a large saucepan over medium-low heat. Add onion; cook, stirring occasionally, until onion is soft and translucent, about 15 minutes. Add cauliflower and 4 cups water. Simmer until cauliflower is very soft, about 10 minutes. Let cool slightly. Working in batches, purée in a blender until very smooth. DO AHEAD: Can be made 2 days ahead. Cover; chill.
Return soup to pot and bring to a simmer, adding more water if too thick. Season with salt. Remove from heat and whisk in remaining 90ml butter and cream. Serve warm in shallow bowls. Rest crostini on edge of each bowl or scatter croutons over; drizzle with chive oil.
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While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.
Historique de l'article
Les informations contenues dans cette page ont été évaluées par des cliniciens qualifiés.
28 janvier 2026 | Publié à l'origine
Auteur: :
UK recipe editors
Examiné par des pairs
UK recipe editors

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