With the power of an Instant Pot, you can get crazy tender beef for gyros!
Add everything but the beef to the pot and stir around to combine.
Add the beef to the pot and stir it around to coat it with the broth. Secure the Instant Pot lid, and make sure the vent is sealed.
Set the Instant Pot to Pressure Cook for 20 minutes and let it do its thing.
When time is up, leave the valve sealed for 10 minutes to vent naturally, then open the valve to quick-release the remaining pressure. Wear hand protection, 'cause a lot of steam is gonna come out of there!
Serve the beef on a pita topped with lettuce, tomato and tzatziki sauce