Gigot d’Agneau au Four (Slow-Roasted Leg of Lamb)

Gigot d’Agneau au Four is the French treatment of a bone-in leg of lamb: simply seasoned, aromatic with garlic and rosemary, and roasted gently until the meat is tender and still pink at the centre. Dijon mustard and olive oil help the herb rub cling to the surface, giving the lamb a savoury crust without masking its natural richness. The browned roasting juices are loosened with dry white wine to make a straightforward pan sauce, while lemon at the table adds freshness. It is a generous roast for Sunday lunch, Easter, or any dinner where carved meat and a glossy sauce are the focus.
Cuisine style French home-style roast
Cooking style Slow-cooked • Make-ahead friendly • Crowd-friendly
Time commitment Slow-cooked

Why this recipe works

  • Gentle roasting: A moderate oven cooks the lamb slowly, helping the meat stay tender while the exterior develops a savoury crust.
  • Simple, layered flavour: Dijon mustard, garlic and rosemary season the lamb deeply without overwhelming its natural richness.
  • Built-in pan sauce: White wine loosens the browned roasting juices, creating a glossy sauce with very little extra work.

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Timing notes

  • Rest before carving: Rest the lamb for 20 minutes so the juices settle and the slices stay moist.
  • If marinated ahead: After chilling, let the rubbed lamb come back towards room temperature before roasting for more even cooking.
  • Mostly hands-off: The active work is brief; most of the time is gentle roasting and resting.

Ingredient notes

  • Bone-in lamb: A bone-in leg suits slow roasting well and makes an impressive centrepiece for carving.
  • Rosemary and mustard: Fresh rosemary brings a piney herb note, while Dijon adds savoury sharpness and helps the rub cling to the meat.
  • Finish with lemon: A squeeze of lemon at the table cuts through the richness and brightens the pan sauce.

Make-ahead tips

  • Rub ahead: The mustard, garlic and rosemary rub can be applied up to 24 hours in advance for deeper flavour.
  • Reheat gently: Warm sliced leftovers with a little pan sauce in a 160°C (320°F) oven until piping hot.
  • Freeze leftovers: Cool cooked lamb quickly, wrap well and freeze in portions for easy future meals.

Authenticity notes

  • French home-style approach: Gigot d’agneau is often treated simply, with aromatic herbs, garlic and a pan sauce rather than heavy accompaniments.
  • Classic accompaniments: Roast potatoes, green beans or a crisp salad all work well with the lamb and wine-enriched juices.

Equipment you'll need

Ingredients
Instructions
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  1. Heat the oven to 160°C (320°F). Pat the lamb dry, then season all over with the fine sea salt and 1 tsp of the black pepper.
  2. In a small bowl, mix the dijon mustard with the olive oil. Finely chop the garlic and rosemary leaves, then stir them into the mustard mixture.
  3. Rub the mustard, garlic and rosemary mixture all over the lamb, working it into any seams. Set the lamb in a roasting pan.
  4. Roast for 2 hours 30 minutes, basting once or twice with the pan juices if you like. The lamb is ready when a thermometer reads about 55 to 58°C (130 to 135°F) for blushing, or 60°C (140°F) for medium, and the meat feels tender when pressed.
  5. Lift the lamb onto a board and rest for 20 minutes. Pour off excess fat from the roasting pan, leaving the browned juices behind.
  6. Set the roasting pan over a medium heat on the hob, add the dry white wine and scrape up the browned bits. Simmer for 5 to 8 minutes until slightly reduced and glossy, then grind in the remaining black pepper.
  7. Slice the lamb and spoon over the warm pan sauce. Serve with lemon wedges for squeezing at the table.

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Recipe notes

Tips

  • For deeper flavour, rub the lamb with the mustard mixture up to 24 hours ahead, cover and chill, then bring back towards room temperature for 45 minutes before roasting.
  • If you prefer the lamb more well done, keep roasting until the thermometer reads 70°C (160°F), then rest as directed so the juices settle.
  • If serving anyone who is pregnant, elderly, or immunocompromised, cook the lamb to 70°C (160°F) and ensure it is piping hot throughout.

Substitutions

  • Replace Fresh rosemary with Fresh thyme for a softer, more floral herb note.
  • Replace Dry White Wine with Dry red wine for a darker, more robust pan sauce.
  • Replace Dijon mustard with Whole-grain mustard for a coarser texture and gentler heat.

Storage

  • Refrigerate up to 3 days
  • Cool leftovers quickly, then refrigerate in a sealed container. Reheat sliced lamb with a splash of the pan sauce in a 160°C (320°F) oven until piping hot, or warm gently in a saucepan; freeze well-wrapped portions for up to 2 months.

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Recipe overview

  • Servings: 4 servings
  • Total time: 3h 30min (25min active)
  • Difficulty: Medium
  • Cuisine: French
  • Allergens:
    Mustard
Freezer friendly Kid friendly

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