Roast leg of lamb with garlic & watercress butter served on a serving plate

Roast leg of lamb with garlic & watercress butter

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(2 ratings)

Prep: 30 mins Cook: 1 hr, 40 mins plus resting


Serves 6-8

Season a leg of lamb with our watercress and garlic butter for a new take on spring lamb. Parmesan breadcrumbs also add a lovely crunch and depth of flavour

Nutrition and extra info

Nutrition: Per serving (8)

  • kcal436
  • fat27g
  • saturates14g
  • carbs7g
  • sugars1g
  • fibre1g
  • protein40g
  • salt0.7g
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  • 2kg bone-in leg of lamb
  • 100g watercress



    With deep green leaves, and crisp, paler stems, watercress is related to mustard and is one of…

  • 3 large garlic cloves, crushed
  • 4 anchovy fillets in oil, drained and finely chopped
  • 70g unsalted butter, softened
  • 3 rosemary sprigs



    Rosemary's intense, fragrant aroma has traditionally been paired with lamb, chicken and game…

For the crumb

  • 100g sourdough bread, torn
  • ½ tbsp olive oil
    olive oil

    Olive oil

    ol-iv oyl

    Probably the most widely-used oil in cooking, olive oil is pressed from fresh olives. It's…

  • 30g finely grated parmesan



    Parmesan is a straw-coloured hard cheese with a natural yellow rind and rich, fruity flavour. It…


  1. Remove the lamb from the fridge 1 hr before cooking. Heat the oven to 200C/180C fan/gas 4. Use the tip of a knife to make 20-25 small slits in the lamb, then set aside in a roasting tin. Blitz the watercress, garlic and anchovies in a food processor until smooth, then add the butter and pulse to combine.

  2. Season the lamb, then spread over half of the butter mixture, pushing into the slits as well. Break the rosemary sprigs into pieces and tuck into the slits. Season, cover with foil and cook for 1 hr 20 mins for medium (a thermometer should read 55C), or 1 hr 40 mins, if you prefer the meat well done. Uncover the lamb halfway through cooking and spread over the remaining butter, then put back in the oven uncovered for the remaining time. 

  3. Meanwhile, blitz the sourdough in a food processor to make coarse crumbs. Toss with the oil and parmesan and spread out flat on a baking sheet. Put in the oven underneath the lamb for the last 20 mins of cooking, or until lightly golden and crunchy. Leave the lamb to rest, covered, for 30 mins, then slice and sprinkle over the crumbs.

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