Pour water on the bottom of your Instant Pot, followed by a trivet or steam basket. It doesn't have to be the one that came with your machine. It just has to fit. Place frozen ground beef brick on top of the trivet and sprinkle dehydrated onions on top.
Lock the lid, close the sealing valve and select HIGH PRESSURE for 25 minutes. It will take about 10 minutes for it to gain pressure before cooking process begins
Once finished, manually release the pressure and open the lid. This will take 5 to 10 minutes. Pull the trivet out of the pot with the meat. Depending on how much liquid and grease is in the bottom of the pot, pour it into a heat-resistant container to cool before disposing. Reserve atleast 3 tablespoons of liquid to help enhance the flavor.
Return the beef to the pot and cut it in half with a wooden spoon or spatula. Most likely, it will still be a bit pink inside. Press CANCEL on your Instant Pot and change the setting to SAUTE. Add remaining spices and cook for about 5 additional minutes, breaking up the meat into crumbled pieces as it continues cooking.
Serve in warm tortillas or crispy shells with refried beans, lettuce, tomato, cheese, salsa, guacamole and Greek Yogurt.