Set the Instant Pot on SAUTE & set it on NORMAL heat settings. Add oil and when the oil becomes moderately hot throw in the minced ginger & garlic and saute for 30 seconds.
Add the marinated chicken and saute until the chicken becomes opaque and begins to become slightly golden around the edges.
Add the liquid and de-glaze the pot very well by scraping the sides and the bottom of the pot with a spatula. This will help to loosen any food particles stuck at the bottom of the pot. As a result, it'll prevent the BURN error.
CANCEL the SAUTE function and close the lid of the Instant Pot. SEAL the valve and PRESSURE COOK on HIGH for just 1 minute.
When the pressure cooking cycle is over the Instant Pot will begin to beep. Quickly do a quick pressure release (QPR) by manually moving the valve from the SEALING to the VENTING position. Open the lid carefully. CANCEL the PRESSURE COOK function.
Hit the SAUTE function and set it on LOW. Add all the ingredients mentioned above in the "Homemade Teriyaki Sauce" section. You'll end up with lots of liquid in the pot. That's fine we'll be cooking down the sauce to thicken.
Bring the sauce to a simmer. Now, add the cornstarch slurry and give everything a good stir. Simmer to thicken the sauce. At this point you can keep the sauce you prefer, I mean the consistency. We love a thicker sauce and that's how I made it.
Turn off the Instant Pot. Add the 1 tsp sesame oil and give everything a quick stir. Garnish with sesame seeds, chopped scallions and serve hot. We served the dish with a side of blanched broccoli. If you want you can toss the steamed or blanched broccoli in the pot. Give a quick stir and than serve. Enjoy!