Method
1. Add the potatoes to the inner pot, add in water until the potatoes are just covered and season the water with salt
2. Secure the lid on the Instant Pot Pro Plus
3. Pressure Cook on Max for 6 mins, then allow for quick steam release
4. Once all the pressure has been released, drain the potatoes and add them to a mixing bowl
5. Add the butter, milk, salt and pepper and using a stick blender, blend until smooth
6. Taste and add more salt, pepper or butter if needed
7. Cover and leave to the side until needed
8. Pat the lamb shanks dry and season with salt and pepper on both sides
9. Quickly rinse and dry the inner pot
10. Add oil to the inner pot
11. Pre-heat the inner pot on Sauté for 40 mins
12. Once the Instant Pot Pro Plus has finished pre-heating, add in the lamb shanks and brown for 4 mins on each side
13. Once the shanks have been browned remove them from the inner pot and place them back on the cutting board
14. Add shallots to the inner pot and Sauté for 3 mins while stirring until they have softened
15. Add the remaining vegetables to the inner pot
16. Sauté for 2 mins
17. Carefully add wine, tomato paste, stock cube, salt and water to the inner pot and mix well
18. Simmer for 2 more minutes
19. Add the lamb shanks with some fresh rosemary and turn the shanks in the sauce so they get a light coating
20. Secure the lid on the Instant Pot Pro Plus
21. Pressure Cook on Max for 60 mins, then allow for Natural release 15 mins, then Quick Release the remaining pressure
22. When all pressure has been released carefully remove the lid of the Instant Pot Pro Plus
23. Gently remove the delicate lamb shanks and place them in a large bowl or dish
24. Place a colander over a clean large bowl and strain the remaining of your sauce to remove the vegetables
25. Mix cornflour and water in a small bowl
26. Pour the sauce and corn flour mixture back into the inner pot and Sauté for 2 mins to thicken the sauce
27. While sauce is thickening, reheat your mashed potato in the microwave or on the stove for 2-4 mins
28. Dollop a generous portion of mashed potato in each serving bowl, top with the cooked lamb and then a ladle full of the sauce from the inner pot