Sprinkle the cornstarch, salt, and pepper over the beef and toss to combine. Marinate at room temperature for 20 minutes.
In a small bowl, prepare the sauce by mixing together the soy sauce, water, brown sugar, and rice vinegar.
In a wok over medium-high heat, heat the peanut oil.
Add the beef and fry just until the surfaces turn brown.
Add the ginger and garlic, and stir-fry until fragrant, 2 or 3 seconds.
Add the sauce and stir to coat the beef.
Turn off the heat and add the scallions. Give it one last stir to very lightly heat up the scallions but not to cook them.
Transfer the dish to a serving plate.
NOTES
Use fresh ginger and garlic for the best flavors.
Take care not to overcook the beef. You just want to brown it, if you overcook it it can get tough.
To make your beef easier to slice, you can freeze it for 10 minutes.
If you like your Mongolian beef spicy, add a pinch of red pepper flakes to the sauce. you can also add a few dried red chiles when stir-frying the beef.
NUTRITION
Nutrition Facts
Easy Mongolian Beef
Amount Per Serving
Calories 199Calories from Fat 81
% Daily Value*
Fat 9g14%
Saturated Fat 2g10%
Cholesterol 68mg23%
Sodium 603mg25%
Potassium 396mg11%
Carbohydrates 2g1%
Protein 24g48%
Vitamin A 30IU1%
Vitamin C 1.1mg1%
Calcium 27mg3%
Iron 1.9mg11%
* Percent Daily Values are based on a 2000 calorie diet.