In a shallow dish combine together all marinade ingredients with beef strips. Cover and marinate in your refrigerator for at least 30 minutes, up to 12 hours.
In a small bowl whisk sauce ingredients until well combined. Set aside until ready to use.
Bring marinated beef out of the fridge and allow to sit on your counter for about 20 minutes or so.
Heat 2 Tablespoons of the oil in a large skillet over medium high-heat. Add in the marinated beef and cook undisturbed for a few minutes , then stir and cook for 1-2 minutes more, until beautifully charred.
Set beef aside on a plate.
Wipe out your skillet and then add in your remaining oil.
Over medium-high heat, add in onions, peppers, garlic and sauté for about 4 minutes until tender crisp, and beginning to soften a bit.
Pour in your sichuan sauce and simmer for a couple of minutes until it begins to thicken.
Return beef to the skillet, toss to coat well in the sauce, and continue to cook for a minute or so, until everything is combined and heated through nicely.
Sprinkle with sesame seeds and serve immediately with cooked brown rice, or quinoa, and broccoli.
