Drizzle olive oil into Instant Pot. Set to saute setting. Add beef pieces and cook until all sides are browned. Add in Worcestershire sauce or coconut aminos and sprinkle with Stone House Seasoning.
Add the onion, carrots, potatoes, beef stock, and tomato sauce to the Instant Pot. Stir to combine. Secure the lid to the Instant Pot, make sure the vent is closed and set for 35 minutes on high setting.
Allow the pressure to release naturally, about 20 minutes. Then, carefully remove the lid to the Instant Pot. Ladle out some of the juices from the beef stew into a small bowl. Whisk in the cornstarch to create a slurry. Then, stir the slurry into the beef stew.