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Sous Vide Leg of Lamb with Asparagus and Mushrooms over Gnocchi

This recipe is by Matt B., a professional market researcher in Seattle, and an amateur at everything else. He cooks because he loves food, science, and challenges, so send him recipe requests anytime!

One afternoon, my roommate came home cradling a large leg of lamb, clumsily dropped it on the counter and asked me what I could do with only it and what was left in the fridge (hence the recipe calling for leftover mashed potatoes).

Two days later, it became this gnocchi dish and its accompanying grave-like silence at the table, followed by discrete plate-licking (mostly by the Jack Russel) and food comas. There's some prep work involved, but trust me, you can taste the love in every bite.

Sous vide leg of lamb with asparagus and mushroom gnocchi

Modernist Tools, Ingredients, and Techniques Used

If you would like more information about the modernist techniques, ingredients, and equipment used in the Sous Vide Leg of Lamb with Gnocchi you can check out the following.

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Sous Vide Leg of Lamb with Gnocchi

  • Published: April 23, 2012
  • By Matt B
  • Prep Time: 120 Minutes
  • Total Time: 48 or up to 60 Hours
  • Cooks: 135°F (57.2°C) for 48 to 60 Hours
  • Serves: 4 to 6

Ingredients for Sous Vide Leg of Lamb with Gnocchi

  • For the Sous Vide Leg of Lamb

  • Leg of lamb, at least 2 pounds boneless or 3 pounds bone-in
  • 1 teaspoon kosher salt per pound of lamb
  • 1/2 teaspoon dry marjoram per pound of lamb
  • 1/2 teaspoon dry parsley per pound of lamb
  • 1/4 teaspoon black pepper per pound of lamb
  • 1/4 teaspoon garlic powder per pound of lamb
  • 1/4 cup rendered lamb fat or olive oil
  • For the Gnocchi

  • 3 cups leftover dry mashed potatoes (OR 2.5 cups chopped potatoes boiled in salt water, 1/2 stick butter, and a lot of salt, mashed
  • 1 cup flour
  • 1 egg
  • For the Sauce

  • 2.5 cups reserved sous vide lamb liquid plus however much chicken or beef stock or broth is needed to measure 2.5 cups
  • 1/2 cup red wine
  • 1/4 cup all-purpose flour
  • 2 tablespoons rendered lamb fat or olive oil
  • 1/2 teaspoon dry marjoram leaf
  • 1/2 teaspoon black pepper

Cooking Instructions for Sous Vide Leg of Lamb with Gnocchi

For the Sous Vide Leg of Lamb

At least 48 to 60 hours before serving

Doggy

Salt the lamb leg with kosher salt--all legs are different, but mine was about four pounds. OPTIONAL BUT HIGHLY RECOMMENDED: trim the lamb of excess fat, and render over medium low heat (caution: will attract Jack Russell Terriers).

Sprinkle the meat with the dry parsley, black pepper, and half a teaspoon of garlic powder. Seal with 1/4 cup rendered lamb fat OR olive oil, and cook in an immersion circulator for at least 48 hours and no more than 60 hours at 135°F (57.2°C).

For more information on the cooking times you can read my detailed article which addresses why is there a range in sous vide cooking times.

Sous-vide-leg-of-lamb-cooked

When the sous vide leg of lamb is done (after 24 hours it will be tender-enough to pull the bone out with your fingers if you like), reserve the liquid from the bag for the sauce later (a boneless 3-pound raw cut netted me 1 cup of liquid).

You will have lost at least 1.5 ounces of water weight per pound from the meat (boneless). Reserve a pound for leftovers. Chop the remaining leg into 1-inch pieces.

For the Gnocchi

Gnocchi mixture cooking

Mix three cups of mashed potatoes with the egg and flour. Bring a pot of salted water to boil. Separate the mashed potato mixture into large handfuls and roll out into 3/4 inch diameter ropes.

Cut into one-inch pieces, and boil in no more than quarter-pound batches until they float (approximately one minute), then remove to a colander and then to an oiled sheet pan. DO NOT OVER-BOIL, they'll get waterlogged and turn to mush.

For the Vegetables and Sauce

Mushrooms-sauteeing

Roughly chop the mushrooms and saute them in a 12-inch skillet over medium-high with two tablespoons of rendered lamb fat and a heavy pinch of kosher salt until they've lost half of their volume and have taken color.

Add two tablespoons of the rendered fat to the pan with a 1/4 cup of AP flour, mix thoroughly to remove the lumps, and cook over medium for three to five minutes, adding the reserved lamb liquid plus stock or broth, and red wine gradually. Add marjoram leaf and black pepper and taste for seasoning.

Sous-vide-asparagus

Preheat the oven to 450 F. Mix the trimmed asparagus with a tablespoon of vegetable oil and two heavy pinches of kosher salt and spread onto a half sheet pan. Roast the asparagus for 20 minutes, turning them halfway through.

Chop into one-inch pieces, and add to the sauce with the mushrooms. Stir in the sous vide leg of lamb pieces.

Sous vided lamb leg with gnocchi

For Finishing the Leg of Lamb

When it's time to serve, saute the gnocchi in two-serving batches over medium-high with 1 teaspoon of olive oil per batch until lightly browned. Top with the sous vide lamb, asparagus, and mushroom sauce. Garnish with fresh parsley or Parmesan cheese.

This recipe is by Matt B., a professional market researcher in Seattle, and an amateur at everything else. He cooks because he loves food, science, and challenges, so send him recipe requests anytime!

If you like this recipe you can get more than 85 other inspiring recipes to get you on your way to sous vide success. It's all in my best selling book Modernist Cooking Made Easy: Sous Vide - Get Your Copy Today!

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Sous Vide Leg of Lamb with Asparagus and Mushrooms over Gnocchi

PT48H 4 - 6 people Ingredients: Leg of lamb at least 2 lbs boneless at least 3 pounds bone-in 1 teaspoon kosher salt per pound of lamb 1/2 teaspoon dry marjoram per pound of lamb 1/2 teaspoon dry parsley per pound of lamb 1/4 teaspoon black pepper per pound of lamb 1/4 teaspoon garlic powder per pound of lamb 1/4 cup rendered lamb fat or olive oil 3 cups leftover dry mashed potatoes (OR 2 1/2 cups chopped potatoes boiled in salted water 1/2 stick butter and a lot of salt mashed) 1 cup all purpose flour 1 egg 1 pound button mushrooms 2 pinches salt 2 1 pound bunches asparagus trimmed 2 pinches salt 2 1/2 cups Reserved sous vide lamb liquid plus however much chicken or beef stock or broth is necessary to get up to 2 1/2 cups 1/2 cup red wine 1/4 cup all purpose flour 2 tablespoons rendered lamb fat or olive oil 1/2 teaspoon dry marjoram leaf 1/2 teaspoon black pepper