Place the beef roast into the pressure cooker insert with the hot water. Squeeze juice from one lime over the top, then sprinkle with cumin, salt and pepper.
Steam valve: Sealing.
Cook on: Manual/High for 60 minutes.
Release: Natural or Quick.
Once cooked, shred it with 2 forks.
Before dinner, dice the mango and avocado and juice the remaining lime. Chop the cilantro. Mix the diced mango, diced avocado, lime juice, cilantro and salt and pepper together in a bowl.
Add the Instant Pot beef into the tortillas and top with the mango-avocado salsa.
Prepare fresh veggies.
Serve Instant Pot Shredded Beef Tacos with Mango Avocado Salsa and fresh veggies.