Remove excess fat from the shanks and and pat dry.
Season generously with salt and black pepper.
Heat the oil in the skillet and sear each side of the lamb shanks for 7 minutes until brown.
Transfer seared lamb shank into the instant pot or pressure pot.
Add all the ingredients, stir well and cover with the lid. Set the vent to sealing and select Pressure Cook. Note: The Pressure pot will take about 10 minutes to start cooking.
Let it cook for 45 mins to 1 hour. Allow the steam to release by itself. Do Not force out steam or pressure by lifting vent.