This pressure cooker beef stew is so easy and the beef is always tender!
Set the Instant Pot to saute, and select the "more" setting. Wait until it displays "Hot." Add the oil and let heat 1 minute. Add the stew meat. Season to taste with salt and pepper and 1 teaspoon of rosemary. Cook, stirring every few minutes, until the meat is browned.
Add the broth. Season to taste with salt and pepper. Lock the lid on and set the Instant Pot to sealing. Press Manual, High Pressure, and set for 45 minutes. Allow to slow release for 10 minutes after the 45 minutes are up, then flip the valve to vent (be very careful not to get burned by hot steam!).
Open the lid once the Instant Pot has finished venting. Add the carrots and potatoes, Replace the lid, put it in the locked position, and set the valve to sealing. Set on manual, high pressure, for 8 minutes. Slow release for 5 minutes before venting.
Mix the cornstarch and water (if using) together in a small bowl until smooth. Open the lid of the Instant Pot and set to saute. Add the cornstarch mixture and bring to a boil. Add the peas and heat until hot. Turn off the Instant Pot.
Taste and adjust seasonings if needed.