Make the sauce first by mixing together soy sauce, hoison, minced garlic, and red chili sauce. Set aside.
Next, place flank steak out on a cutting board and cover with parchment paper. Use a meat tenderizer to tenderize the flank steak for 1-2 minutes and until it is 1/2" thick.
Then slice your flank steak in half (vertically) and cut each half into thin strips.
Turn on the Instant Pot's saute function and add olive oil to the pot. Add flank steak and sear on all sides, about 2 minutes.
Next, turn off Instant Pot. Add sauce to the flank steak. Mix well and cover Instant Pot.
Turn the pressure valve to seal and cook meat on high pressure for 8 minutes.
Quick release pressure and uncover Instant Pot. Then, place broccoli on top of the flank steak.
Place lid back on the Instant Pot, turn pressure valve to seal, and set the time "0" minutes. The pressure will build and beep when it reaches full pressure. This is when you quick release.
Remove beef and broccoli from the Instant Pot, leaving the sauce. Add cornstarch to sauce and whisk.
Serve with rice or fried rice.