Trim a tablespoon or so of fat from the roast and chop into bits. Place in the pressure cooker and melt over medium heat (Sauté mode in electric models).
Brown the roast on all sides, a few minutes a side.
Add remaining ingredients to pressure cooker and stir.
Seal pressure cooker and cook at high pressure for 40 minutes. Let pressure release naturally.
Remove beef from pot and place on a cutting board or plate. Shred with two forks. Place beef back into the juices.
Serve beef with a few tablespoons of juice on sandwich rolls with your choice of toppings: pepperoncini, giardiniera, provolone cheese, cheddar cheese, onions, lettuce, tomatoes, etc. You can also serve the juice on the side for dipping.