Set the Instant Pot to sauté and add oil to the insert.
When hot, add lamb shoulder and brown on both sides, then remove, place on a plate and set aside.
Turn off the Instant Pot, add stock and scrape the bottom of the insert to deglaze.
Then mix in the anchovies and garlic purée.
Put the lamb back in the Instant Pot insert, sprinkle the oregano and salt on top and add in the rosemary sprig.
Place lid on the Instant Pot, close and turn the valve to the sealing (not venting) position.
Set the Instant Pot to manual/pressure cook, high pressure for 90 minutes.
When cook time is done, allow for at Natural Pressure Release (NPR) of 15 minutes and then perform a quick pressure release (QPR) to remove remaining steam.
Slice, garnish and serve.
Video
Notes
I used a whole bone-in shoulder of lamb. If the lamb shoulder comes rolled and tied with string, remove it before cooking.
Try replacing some of the stock with white wine for extra flavor.
Pair with mint jelly for Easter. See the section included the post for how to easily make your own homemade mint jelly.
For a lovely presentation on your holiday table, serve garnished with fresh herbs such as parsley and rosemary. And topping with sliced green onions and a sprinkling of pomegranate seeds gives it extra festive Christmas color.
There are 6 WW Blue Plan SmartPoints in one serving.