Gigot d’Agneau Rôti (Roast Leg of Lamb) with Flageolet Beans

Gigot d’agneau rôti is the French-style roast leg of lamb at its most recognisable: a bone-in joint carved into generous slices, served with its savoury roasting juices. Garlic, rosemary and Dijon mustard give the meat a fragrant crust and a gentle tang, while careful roasting and resting keep the centre tender and blushing. Flageolet beans are a traditional partner for lamb, prized for their small size, creamy texture and ability to absorb stock, wine, shallots and pan juices without becoming heavy. The result is a generous dinner dish with clear flavours, well suited to a Sunday roast, Easter table or any meal where the lamb should be the centrepiece.
Cuisine style French roast dinner
Cooking style Crowd-friendly
Time commitment Under 2 hours

Why this recipe works

  • Classic roast method: Starting the lamb hot encourages browning before a gentler roast brings the centre to a tender, blushing finish.
  • Deep savoury flavour: Garlic, rosemary and Dijon season the lamb directly, while the pan juices enrich the beans at serving.
  • Complete, satisfying plate: The flageolet beans turn the roast into a generous main course, adding softness and savoury depth alongside the carved lamb.

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Timing notes

  • Rest before carving: Allow the lamb to rest well after roasting so the slices carve cleanly and stay juicy.
  • Use the resting time: Warm and reduce the flageolet beans while the lamb rests, so both components are ready together.
  • Serve promptly: Carve the lamb just before serving and spoon over the warm roasting juices for the best texture and flavour.

Authenticity notes

  • Classic accompaniment: Flageolet beans are a traditional French partner for roast lamb, valued for their delicate flavour and ability to absorb savoury juices.
  • French home-style roast: The combination of garlic, rosemary, mustard and pan juices gives the dish a simple, recognisably French roast-dinner character.

Ingredient notes

  • Choose cooked flageolets: Cooked and drained flageolet beans keep the side dish quick, with enough time in the pan to absorb the stock, wine and lamb juices.
  • Use a dry white wine: A dry white wine keeps the beans savoury and bright rather than sweet.
  • Keep the beans intact: Simmer gently and stir with care so the beans stay whole while the liquid reduces.

Common mistakes

  • Roasting too far: Use a thermometer rather than relying only on time; leg size and shape can change the cooking window.
  • Carving too soon: Skipping the rest can make the juices run onto the board instead of staying in the meat.
  • Watery bean liquor: If the bean liquid tastes thin, simmer it uncovered a little longer until lightly reduced and savoury.

Equipment you'll need

Ingredients
Instructions
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  1. Heat the oven to 200°C (390°F). Pat the lamb dry, then peel and crush the garlic and strip the rosemary leaves from the sprigs. Mix the garlic, rosemary, Dijon mustard, olive oil, fine sea salt and black pepper into a paste.
  2. Rub the mustard mixture all over the lamb, working it into any seams. Set the lamb in a roasting pan and roast for 20 minutes to start browning. Reduce the oven to 170°C (340°F).
  3. Continue roasting for 45 to 60 minutes, depending on thickness, until the centre reads 55 to 58°C for blushing, or 60 to 63°C for more medium. If the top is colouring too quickly, turn the oven down slightly and rotate the pan. Lift the lamb out onto a board to rest.
  4. While the lamb rests, peel and finely chop the shallots. Pour off excess fat from the roasting pan, leaving the browned bits and juices behind. Set the pan over a medium heat, add a splash of the wine and scrape up the sticky bits.
  5. In a saucepan over medium heat, melt the butter and soften the shallots for 4 to 5 minutes until translucent. Add the flageolet beans, then pour in the remaining wine and the lamb stock. Simmer gently for 8 to 10 minutes until the beans are hot and the liquid is lightly reduced.
  6. Pour any resting juices from the board into the roasting pan juices, then taste and adjust seasoning if needed. Carve the lamb into slices and serve with the warm flageolet beans. Spoon the roasting juices over the lamb and beans.

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Recipe notes

Tips

  • For the juiciest slices, rest the lamb for at least 15 minutes before carving; it should feel relaxed and the juices will run clearer.
  • If you are serving anyone who should avoid alcohol, simmer the wine for 1 minute before adding the stock so the harsh alcohol edge cooks off.
  • If you prefer a thicker bean liquor, simmer for a few extra minutes uncovered, stirring gently so the beans stay intact.

Substitutions

  • Replace Fresh rosemary with fresh thyme for a softer, more floral herb note.
  • Replace Dijon mustard with whole-grain mustard for a milder heat and a coarser texture.
  • Replace Unsalted butter with Olive oil for a lighter finish to the beans.

Storage

  • Refrigerate up to 3 days
  • Cool leftovers quickly, then refrigerate the lamb and beans in separate airtight containers. Reheat the beans gently in a saucepan with a splash of lamb stock, and warm the lamb slices in a 160°C (320°F) oven until piping hot to avoid drying out.

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Gigot d’Agneau Rôti (Roast Leg of Lamb) with Flageolet Beans
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Recipe overview

  • Servings: 4 servings
  • Total time: 2h (35min active)
  • Difficulty: Medium
  • Cuisine: French
  • Allergens:
    Milk Mustard

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