Cube your pork tenderloin and place in a bowl. Add 1 tsp soy sauce and 1 tsp sesame oil and stir to coat. Marinate for at least 30 minutes. I prefer marinating for an hour if time permits.
Once marinated, add half your cornstarch to pork and stir to coat each cube. Keep remainder of the cornstarch - we'll be using the rest of it in a few minutes.
Heat a 12-inch nonstick pan over medium-high heat. Add canola oil and once hot, put in your pork in a single layer.
Cook for 3 minutes, without moving.
After 3 minutes, flip your meat and cook an additional 3 minutes.
Stir and cook an additional minute, or until cubes of meat are browned on all sides. Remove pork from pan with a slotted spoon and place on a plate. Set aside.
Return the pan to heat and add in your garlic and ginger. (I had enough oil left in my skillet to brown, but if you don't add in another teaspoon if needed.)
Cook your garlic and ginger for about a minute.
Add in 1/2 cup of water, 2 tbsp soy sauce and 2 tbsp brown sugar. Stir, while scraping up any browned bits.
Add in your cooked pork, scallions, chili flakes and bring to a simmer. Simmer for 2 minutes.
Take your remaining cornstarch and add in 1/3 cup of water and stir, to make a slurry.
Pour into the pan and cook for another 2-3 minutes, while stirring constantly until sauce is thickened.
Remove the Mongolian pork from heat and serve with steamed rice and your favorite steamed vegetables. Enjoy!
NOTE
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