Place brisket in the instant pot. Pour in water and Worcestershire sauce. Top with pepper. Set pressure cook/manual to 60 minutes. Release pressure. Shred what you can of the brisket into the broth. Set again to pressure cook/manual mode to 60 minutes. Release pressure.
Shred brisket with a fork. Top with barbecue sauce and toss well.
Plate on buns with onions and pickles for toppings. Serve with side dish or chips.
Notes
Serve with chips, coleslaw, mac and cheese, or beans.