Make Sauce: In a small bowl whisk all the sauce ingredients together and set aside.
Marinade: Add the beef, 1 tbsp soy sauce and 1 tbsp red wine to a bowl, toss everything together and let it sit for 10 minutes to marinade.
Cook Beef: Add the peanut oil to a wok and heat over high heat. The wok needs to be quite hot before adding the beef to it. Add the beef to the hot wok and cook for about 3 min over high heat until it's lightly charred.
Cook Veggies: Push the beef to the side of the wok and add the onion and peppers and cook for about 1 minute until the vegetables start to soften a bit. Add the green onions and stir everything together.
Combine: Pour the sauce over the beef and veggies and cook for another 30 seconds to 1 minute until the sauce thickens a bit from the cornstarch.