Yukon Gold and Fennel Puree with Rosemary Butter
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 16 Jan 2026
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This elegant Yukon Gold and fennel purée offers a sophisticated twist on traditional mashed potatoes. By roasting the fennel and onion until caramelised and tender, you introduce a deep, mellow sweetness that perfectly complements the buttery texture of the potatoes. It is a wonderfully fragrant vegetable side dish that brings a touch of refined flavour to any Sunday roast or festive gathering.
Naturally vegetarian and incredibly comforting, this dish is enriched with a homemade rosemary butter and a dollop of crème fraîche for a silky, luxe finish. It is an excellent make-ahead option for busy hosts, as it can be prepared several hours in advance and gently reheated. Serve it alongside roasted meats or as a savoury base for grilled autumn vegetables.
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Ingredients for Yukon Gold and Fennel Puree with Rosemary Butter
3 large fresh fennel bulbs (about 1.0kg total), trimmed, quartered through core, centre core trimmed and discarded, cut into 3/4-inch pieces
1 medium onion, cut into 3/4-inch pieces (about 425ml )
3 tablespoons extra-virgin olive oil
2 teaspoons fine sea salt, divided
1.4kg Yukon Gold potatoes, peeled, cut into 1 1/2-inch pieces
110g (1 stick) butter
1 1/2 tablespoons chopped fresh rosemary
120ml crème fraîche*
How to make Yukon Gold and Fennel Puree with Rosemary Butter
Preheat oven to 191°C. Line large rimmed baking sheet with parchment paper. Combine fennel, onion, oil, and 1 teaspoon sea salt in large bowl; toss. Spread in single layer on prepared baking sheet; sprinkle with pepper. Roast until fennel and onion are very tender, about 1 hour 15 minutes. Cool slightly. Transfer fennel mixture to processor and puree until almost smooth.
Cook potatoes in large pot of boiling salted water until very tender, about 25 minutes. Drain well. Cool slightly. Place in large bowl and mash with potato masher until smooth. Mix in fennel puree.
Melt butter with rosemary and 1 teaspoon sea salt in small saucepan over medium heat. Stir butter mixture into fennel-potato puree. Mix in crème fraîche. Season to taste with more pepper and salt, if desired. DO AHEAD: Can be made 6 hours ahead. Transfer puree to large microwave-safe bowl. Cover with plastic wrap. Chill. Before serving, microwave on high until heated through, about 4 minutes.
Sold at some supermarkets and at specialty foods stores.
Disclaimer
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.
Article history
The information on this page is peer reviewed by qualified clinicians.
16 Jan 2026 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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