Place roast, water and Better than Bouillon Beef Base in instant pot. Set manual mode for 20 minutes per pound of roast.
Let pressure release naturally.
Once the pressure is released, shred beef, adding some of the cooking liquid, about a 1/4 cup.
To create the gravy, separate fat from cooking liquid, add desired amount of liquid into a pot.
Create a cornstarch slurry by mixing 1 tablespoon of cornstarch and 1 tablespoon of water in a separate bowl. Add to pot of cooking liquid. Heat on medium high heat unil liquid boils and thickens, stirring constantly.
Serve warm with your favorite sides. Enjoy!