Gigot d’Agneau au Four (Slow-Roasted Leg of Lamb)
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.
Get the most out of this recipe
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
- 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.
- 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.
- Rub the mustard, garlic and rosemary mixture all over the lamb, working it into any seams. Set the lamb in a roasting pan.
- 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.
- Lift the lamb onto a board and rest for 20 minutes. Pour off excess fat from the roasting pan, leaving the browned juices behind.
- 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.
- Slice the lamb and spoon over the warm pan sauce. Serve with lemon wedges for squeezing at the table.
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
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Allergens:
Mustard
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