Gigot d’Agneau Rôti à l’Ail et au Thym (Roast Leg of Lamb with Garlic and Thyme)
Why this recipe works
- Aromatic crust: Garlic, thyme, olive oil and Dijon mustard form a savoury rub that seasons the lamb and helps build flavour as the surface browns.
- Classic roasting method: Starting hot at 200°C (390°F) encourages browning, then lowering the oven to 170°C (340°F) lets the leg finish more gently.
- Glossy pan gravy: Deglazing the roasting pan with wine and stock captures the caramelised juices, then butter gives the finished gravy a smooth, rounded texture.
Get the most out of this recipe
Timing notes
- Rest before carving: Let the lamb rest for 15 to 20 minutes after roasting so the juices settle and the meat slices more cleanly.
- Serve after resting: Carve once the gravy is ready and serve while the slices are still warm and moist.
Common mistakes
- Relying only on time: A bone-in leg can vary in thickness, so use a thermometer for the most reliable doneness rather than cooking by minutes alone.
- Carving too soon: Cutting immediately after roasting can release too much juice onto the board and make the lamb seem drier.
- Losing the pan juices: Pour off excess fat carefully, but keep the browned bits in the pan; they are what give the gravy its savoury depth.
Ingredient swaps
- For an alcohol-free gravy: Replace the dry white wine with extra beef stock, scraping the pan well to lift the caramelised juices.
- Use rosemary instead of thyme: Fresh rosemary gives the rub a more robust, piney flavour that also works well with lamb.
- Try whole-grain mustard: Whole-grain mustard can replace Dijon for a coarser texture and a slightly more rustic finish.
Serving ideas
- Serve with potatoes: Roast potatoes, gratin dauphinois or buttery boiled potatoes suit the garlicky lamb and savoury gravy.
- Add green vegetables: Green beans, peas, asparagus or a simple bitter-leaf salad bring freshness alongside the rich meat.
- Wine pairing: A medium-bodied red such as Côtes du Rhône or Pinot Noir works well with the herb rub and roasted lamb.
Equipment you'll need
Ingredients
Instructions
- Heat the oven to 200°C (390°F). Pat the lamb dry and sit it in a roasting pan.
- Crush the garlic to a paste, then strip the thyme leaves from most of the sprigs. Mix the garlic and thyme with the olive oil, Dijon mustard, fine sea salt and black pepper, then rub all over the lamb.
- Roast for 20 minutes to brown, then reduce the oven to 170°C (340°F). Continue roasting for 45 to 60 minutes, or until the thickest part reads 55 to 60°C for medium, or 60 to 65°C for medium-well.
- Transfer the lamb to a board and rest for 15 to 20 minutes, loosely covered. This resting time keeps the meat juicy and makes carving easier.
- Carefully pour off excess fat from the roasting pan, leaving the browned bits and juices behind. Set the pan over a medium heat on the hob, add the dry white wine and scrape well to loosen the caramelised bits.
- Add the beef stock and simmer for 5 to 8 minutes until slightly reduced and glossy. Whisk in the unsalted butter off the heat, then taste and adjust with a little more fine sea salt and black pepper if needed.
- Carve the lamb and serve with the warm pan gravy. Scatter over the remaining thyme leaves for a fresh finish.
Recipe notes
Tips
- For the most reliable doneness, use a thermometer and take the lamb out a few degrees early, as it will rise slightly while resting.
- If serving anyone who is pregnant, elderly, or immunocompromised, cook the lamb to at least 70°C (160°F) and ensure the juices run clear.
Substitutions
- Replace Dry White Wine with beef stock for an alcohol-free gravy.
- Replace Fresh thyme with fresh rosemary for a more robust, piney flavour.
- Replace Dijon mustard with whole-grain mustard for a coarser texture in the rub.
Storage
- Refrigerate up to 3 days
- Cool leftovers quickly, then refrigerate in a sealed container. Freeze sliced lamb with a little gravy for up to 2 months; defrost overnight in the fridge and reheat in a 180°C (355°F) oven, covered, until piping hot.
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Recipe overview
- Servings: 4 servings
- Total time: 2h (20min active)
- Difficulty: Medium
- Cuisine: French
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Allergens:
Milk Mustard
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