Slow-Roasted Duck with Olive Gravy and Garlic-Fennel Confit
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 17 Jan 2026
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This slow-roasted duck with olive gravy and garlic-fennel confit is a masterclass in developing deep, savoury flavours through patient cooking. By roasting the bird slowly, the fat renders away to leave behind succulent meat and beautifully crisp skin, while the fennel and garlic soften into a fragrant, buttery confit. The addition of Kalamata olives provides a sophisticated saltiness that cuts through the richness of the meat, creating a balanced and impressive centrepiece.
As a diabetes-friendly option, this dish focuses on high-quality fats and aromatic vegetables rather than sugary glazes or starch-heavy sauces. The gravy is thickened naturally by puréeing the roasted vegetables, making it a nutritious and gluten-free alternative to traditional roux-based sauces. Serve this elegant roast with a side of steamed seasonal greens for a wholesome and restorative weekend meal that feels truly indulgent.
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Ingredients for Slow-Roasted Duck with Olive Gravy and Garlic-Fennel Confit
2 (4-pound) ducks, necks reserved, rinsed inside and out, patted dry, and any feathers and quills removed with tweezers or needle-nose pliers
1 teaspoon kosher salt, plus additional to taste
1/2 teaspoons freshly ground black pepper, plus additional to taste
1 bunch fresh thyme
1 head garlic, cloves separated, skin left on
8 shallots, peeled and halved
4 heads fennel, trimmed (fronds reserved for garnish), halved lengthwise, and cut into 1/4-inch slices
240ml pitted kalamata olives
1 teaspoon finely grated lemon zest
1 teaspoon freshly squeezed lemon juice, plus additional to taste
How to make Slow-Roasted Duck with Olive Gravy and Garlic-Fennel Confit
Preheat oven to 260°C.
Season each duck inside and out with salt and pepper. Using knife, skewer, or sharp fork, prick skin of each bird all over 20 to 30 times, taking care not to let knife puncture flesh (it's helpful to hold knife nearly parallel to duck and then slide it in). Stuff each cavity with 1 neck; 1/2 of thyme and garlic; 8 shallot halves; and 1/4 of fennel. Using kitchen string, tie legs loosely together.
Transfer ducks, breast sides up, to rack set in large roasting pan. Cover loosely with foil and roast 15 minutes. Reduce heat to 149°C and continue to roast, basting every 30 minutes and skimming fat from pan juices occasionally, 3 hours.
Remove foil from ducks. Stir remaining fennel into pan juices and roast 30 minutes more. Stir olives into pan juices and roast until duck skin is dark golden and crisp and meat is tender, about 30 minutes more (total roasting time: about 4 1/4 hours). Transfer ducks to cutting board.
Remove rack from roasting pan. With slotted spoon, remove fennel and olives from pan juices and place in blender. Pour pan juices into 1-quart glass measure. Skim fat off top and reserve for another use. Add juices to fennel and olives in blender, then add lemon zest and juice. Purée until smooth. Taste and add salt and pepper and additional lemon juice if desired.
Remove confit vegetables from cavities and carve ducks. Arrange meat and vegetables on platter. Garnish with chopped fennel fronds. Serve sauce alongside.
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.
17 Jan 2026 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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