Add lamb, onion, garlic, tomato, spices, olive oil and tied bunch of cilantro to pressure cooker. Put on high heat and cover for 10 minutes.
Peel and snap green beams. Let sit in cold water until ready to use.
Release pressure and remove lid. Mash garlic with wooden spoon. If lamb is cooked, remove from pot and let sit in tagine. If it's not quite ready, return it to pot for remaining cook time.