Set pressure cooker to "sear", press "start/stop", and add oil. When oil is hot, add onions and garlic. Cook until onions are soft and lightly golden in color.
Add potatoes and spinach.
Add soy sauce, pepper, and vegetable stock.
Close and lock lid. Set cooker to "soup", adjust time to 8 minutes, and press "start/stop".
When done, quick release and make sure all pressure is released before opening lid.
Carefully open lid and add lime juice. Season to taste with sea salt and pepper. Serve and enjoy.