Put sliced meat into a large ziploc bag and toss with cornstarch, lightly coating meat.
Add oil to pot and add in the meat, saute for 2-3 minutes, stir several times. Lightly browning meat.
Add in brown sugar, garlic, ginger, 1 cup water, sesame oil, soy sauce, and red pepper flakes. Stir well until combined.
Close lit and set pressure to High Pressure for 8 minutes. Do a 10 minutes Natural Release and then release pressure.
Stir together 2 Tbsp cornstarch and 1/2 cup water to make a slurry. Add into pot and then turn on the saute feature. Cook, stirring often for 2-3 minutes until the sauce thickens. Sauce will thicken more as it sits.
Serve over rice, garnish with green onions and sesame seeds.