Set your Instant Pot to Saute
Add Olive oil, onion, and garlic to Instant Pot.
Saute until the onion is translucent.
Add ground beef and start to brown. Don't worry about cooking it all the way through.
Add oregano, marjoram, Greek seasoning, and beef broth.
Seal lid on Instant Pot.
Cook on high pressure for 5 minutes.
Set Instant Pot to Saute once again. Saute beef, while stirring. This will thicken the mixture.
Build your gyro and enjoy!
Stir all the ingredients together.
Marinate in the fridge 1/2 hour before eating.