Ingredients for Sauce:

3 cloves garlic (minced)
1/2 tsp black pepper
1/2 tsp ginger (minced)
2 Tbsp brown sugar
​1/3 cup soy sauce

1 cup beef broth
2 Tbsp. rice vinegar
1 tsp seame oil
​2 Tbsp. cornstarch

Ingredients for Steak and Vegetables:

2 lbs. steak (2-inch long thin slices)
1 red bell pepper (bite size pieces)
​1 green bell pepper (bite size pieces)

1 medium white onion, sliced
​2 Tbsp. vegetable oil, divided

Directions:

Make the sauce by mixing all the ingredients into a medium bowl.  Stir until well combined.
In a large skillet heat 1 Tbsp. oil over medium-high heat.  Add the steak to the pan and cook for ~5 minutes or until lightly browned. Remove and place on a plate.
Add 1 Tbsp oil to skillet. Add pepper and onions and cook 3 minutes until tender. Add steak back to skillet.
Stir the sauce again and add to skillet.  Bring to a simmer and cook for 4-5 minutes until the sauce begins to thicken.  Serve over rice and garnish with sesame seeds if desired.