Fill the bottom of your Instant Pot with 1 cup of water. Add the trivet (or a steamer basket) into the Instant Pot and pile your broccoli on top. Lock your lid in place.
Press STEAM and adjust the time to one minute. After the cooking cycle has completed, perform a Quick Release. Remove the broccoli from the Instant Pot and set aside.
Combine the marinade ingredients together in a small bowl and whisk together.
In your Instant pot, turn the SAUTE feature on and add the oil to the pot. Add the chopped garlic into the oil and stir until fragrant. Turn off the SAUTE feature.
Add the beef, beef broth, and marinade into the pot.
Set to MANUAL and set the timer for 10 minutes. Once the cooking cycle is complete, allow for a natural release for 10 minutes. Then perform an Instant release for the rest of the pressure.
Leaving the cooked beef inside, turn the Instant Pot to Saute.
In a small bowl, whisk together water and cornstarch. Add into the pot and stir. As the sauce begins to boil, it will thicken! If your sauce has been boiling for a few minutes and isn’t thickening, mix together another tsp of cornstarch and another tbsp of water, and add. Repeat until thick.
Stir the cooked broccoli into the beef mixture and enjoy!