Season pork with salt and pepper and add to large mixing bowl. Add Dijon mustard and coat pork.
Set pressure cooker to "sear", add 1T oil, adjust time to 15 minutes, and press "start/stop". When hot, add pork. Sear pork on all sides, cooking in batches, if necessary. Remove and set aside.
Add remaining oil, onions, garlic, and bay leaves. When onions are golden brown, add tomato juice, red wine, cayenne pepper, oregano, and nutmeg. Return pork to cooker.
Close and lock lid, set pressure cooker to "meat/stew", adjust time to 45 minutes and press "start/stop".
When done, quick release and make sure all pressure is released before opening lid.
Carefully open lid and add kale. Stir and close lid. Let kale wilt slightly, about 5 minutes. Check seasoning and add salt and pepper, if needed. Serve stew with rice or orzo pasta.
