
Whisk all of the sauce ingredients in a small mixing bowl and set aside.
Dip the steak pieces into the egg and then dredge into the cornstarch, evenly coating each piece.
Cover the bottom of a heavy skillet with oil and heat over medium-high heat. Working in batches, add the battered steak and cook for 2-4 minutes on each side until the steak is cooked through and the coating is golden brown.
Set cooked steak aside on a plate lined with paper towels to drain.
Add the remaining tablespoon of oil to a large skillet along with the diced onion and bell peppers. Saute for 2-4 minutes or until the vegetables are softened.
Add the sauce to the skillet and cook for 2-3 minutes until the sauce is thickened.
Add the beef to the pan, toss to coat and remove from the heat. Serve immediately with rice, enjoy!