Cut beef into 1-2 inch chunks, removing most of the fat.
Combine all ingredients in the Instant Pot, seal lid and turn the pressure valve to sealed.
Set manual pressure time on high for 55 minutes.
When the pressure cooking time has finished, let the pressure release naturally.
Turn the Instant Pot off to let the liquid cool. Remove beef and bay leaves from the pressure cooker and set aside, leaving liquid in the inner pot. Shred beef,
Use an immersion blender to blend spices, garlic, onion, and liquid together.
Add the beef back to the pot, if desired.
Serve beef on tortillas and top with sauce and other fixings.
Notes
Note: One reader recommends placing the beef under a broiler for a few minutes after shredding to give it a slight char and added texture.