Mix the meat with chopped onion, garlic, chopped parsley, spices, and olive oil.
Brown the meat & spice mix over a medium heat for about 10 minutes, stirring occasionally, the pot doesn't need to be covered at this point
Add 3 cups of water and cover the pressure cooker. Cook the meat under pressure for about 40 minutes starting the timer from when it whistles and heat is reduced.
When the time is up you can put the pressure cooker under a cold tap to hasten the cooling process, this allows you to release the whistle and open the lid sooner. ALWAYS WAIT UNTILL ALL AIR IS RELEASED before attempting to open.
Check that the meat is tender and if so you can then add the potatoes, olives, and preserved lemon.
If necessary, add more water so that the gravy ALMOST reaches the top of the potatoes then partially cover and simmer for about 15 minutes, or until the potatoes are cooked and the sauce is reduced & thickened.
Taste for salt and adjust the seasoning if necessary before completely done. you can then serve the stew into a pretty tagine or traditional Moroccan plate if you have one. When serving, serve the meat pieces first around the plate, followed by the potatoes on top, then add the olives & gravy evenly around the plate before garnishing with the preserved lemon on the top centre.