Add Sauce Mixture ingredients to the pot and stir until well combined. Add beef and toss to coat. Secure the lid, making sure the vent is closed.
Using the display panel select the MANUAL or PRESSURE COOK function*. Use the +/- keys and program the Instant Pot for 10 minutes.
When the time is up, quick-release the remaining pressure.
Remove 1/4 cup of cooking liquid and mix with cornstarch (If you cant get 1/4 cup of cooking liquid out, supplement with water).
Stir cornstarch slurry, broccoli florets and toasted sesame oil into the pot for 3-5 minutes until broccoli is tender and sauce has thickened, returning to SAUTE mode as needed.
Garnish with sesame seeds (optional). Serve over rice or zucchini zoodles.
