Roast Leg of Lamb with Onion Gravy and Mint Salsa Verde

Roast Leg of Lamb with Onion Gravy and Mint Salsa Verde is a medium British recipe that serves 6. 550 calories per serving. Recipe by Jamie Oliver on YouTube.

Prep: 30 min | Cook: 1 hr 45 min | Total: 2 hrs 35 min

Cost: $39.65 total, $6.61 per serving

Ingredients

  • 5 lb Leg of Lamb (bone‑in, trimmed)
  • 4 sprigs Rosemary (fresh)
  • 3 cloves Garlic (sliced)
  • 4 fillets Anchovy Fillets (thinly sliced)
  • to taste Salt (sea salt)
  • to taste Black Pepper (freshly ground)
  • 3 pieces Onion (peeled and sliced)
  • 1 tablespoon All-Purpose Flour (for gravy)
  • 100 ml Red Wine (dry, for deglazing)
  • 470 ml Chicken Stock (preferably low‑sodium)
  • 0.5 cup Mint Leaves (packed)
  • 0.5 cup Parsley (packed)
  • 1 small Gherkin (finely diced)
  • 1 teaspoon Capers (rinsed)
  • 1 tablespoon Olive Oil (extra virgin)
  • 1 teaspoon Dijon Mustard (smooth)
  • 1.5 teaspoon Red Wine Vinegar (for salsa verde)
  • 1 large Swede (Rutabaga) (peeled and cubed)
  • 4 medium Potatoes (peeled and cubed)
  • 2 tablespoons Butter (for smashing veg)

Instructions

  1. Insert aromatics into the lamb

    Using the tip of a sharp knife, make small slits in the leg of lamb where the meat shows a pink‑white seam. Insert a slice of garlic, a piece of rosemary, and a thin bit of anchovy into each slit.

    Time: PT10M

  2. Season the lamb

    Rub the entire leg with sea salt and freshly ground black pepper, ensuring the seasoning reaches the inserted aromatics.

    Time: PT5M

  3. Preheat the oven

    Set the oven to 180°C (350°F) and allow it to come to temperature.

    Time: PT10M

    Temperature: 180°C

  4. Roast the lamb

    Place the seasoned leg on the rack inside the roasting pan. Roast for 1 hour 30 minutes, basting once halfway through with pan juices.

    Time: PT1H30M

    Temperature: 180°C

  5. Prepare onion mixture for gravy

    While the lamb roasts, peel and halve 3 onions, then slice them thinly. Set aside.

    Time: PT10M

  6. Add aromatics to the roasting pan

    After the lamb has roasted for about 30 minutes, scatter the sliced onions, any remaining garlic, rosemary, and anchovy bits into the pan. They will soak up the lamb fat and begin to caramelise.

    Time: PT5M

  7. Rest the lamb

    When the lamb reaches the desired internal temperature, remove it from the oven, transfer to a cutting board, and loosely cover with foil. Let rest for 10 minutes.

    Time: PT10M

  8. Degrease the pan

    Skim off excess fat from the roasting pan, leaving about 1 tablespoon of liquid and browned bits.

    Time: PT5M

  9. Make the roux

    Place the roasting pan on the stovetop over medium‑high heat. Sprinkle 1 tablespoon of flour over the pan juices and stir continuously for 2 minutes until lightly golden.

    Time: PT2M

  10. Deglaze with red wine

    Add 100 ml of dry red wine, stirring to dissolve the roux. Cook for 3 minutes until the wine reduces slightly and the mixture thickens.

    Time: PT3M

  11. Finish the onion gravy

    Stir in 470 ml of chicken stock, bring to a gentle simmer, then reduce heat to medium‑low and cook for 10 minutes, stirring occasionally, until the gravy reaches a silky consistency.

    Time: PT10M

  12. Season the gravy

    Season the gravy with additional salt and pepper if needed.

    Time: PT2M

  13. Prepare salsa verde

    In a food processor, combine mint, parsley, half a garlic clove, one anchovy fillet, the diced gherkin, and capers. Pulse until finely but still rustic.

    Time: PT2M

  14. Finish salsa verde

    Add 1 tablespoon olive oil, 1 teaspoon Dijon mustard, a pinch of salt and pepper, and 1.5 teaspoons red wine vinegar. Pulse briefly to combine.

    Time: PT1M

  15. Cook smashed veg

    Place the cubed swede and potatoes in a pot of salted boiling water. Cook for about 20 minutes, or until fork‑tender.

    Time: PT20M

    Temperature: 100°C

  16. Mash the vegetables

    Drain the veg, return to the pot, add 2 tablespoons butter, and smash with a potato masher or fork until a rustic mash forms.

    Time: PT5M

  17. Plate and serve

    Slice the rested lamb, arrange on a serving platter with a mound of smashed veg, drizzle salsa verde over the meat, and serve the onion gravy on the side.

    Time: PT5M

Nutrition Facts

Calories
550
Protein
35 g
Carbohydrates
30 g
Fat
30 g
Fiber
5 g

Dietary info: Contains gluten, Contains meat, Contains dairy

Allergens: Fish (anchovies), Dairy (butter), Mustard

Last updated: March 18, 2026

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Roast Leg of Lamb with Onion Gravy and Mint Salsa Verde

Recipe by Jamie Oliver

A succulent bone‑in leg of lamb roasted with rosemary, garlic and anchovy for deep umami, served with a rich caramelised onion gravy and a bright Italian‑style mint salsa verde. Accompanied by buttery smashed swede and potatoes, this is a show‑stopping main course perfect for a family dinner or holiday feast.

MediumBritishServes 6

Shop all ingredients on Amazon in one click • Printable PDF with shopping checklist

Source Video
50m
Prep
2h 25m
Cook
23m
Cleanup
3h 38m
Total

Cost Breakdown

$39.65
Total cost
$6.61
Per serving

Critical Success Points

  • Insert aromatics into the lamb
  • Roast the lamb to proper internal temperature
  • Make the roux without burning
  • Rest the lamb before carving

Safety Warnings

  • Handle raw lamb with separate cutting board and wash hands thoroughly.
  • Use oven mitts when handling hot roasting pan.
  • Sharp knife required for inserting aromatics; cut away from body.

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