Season sliced meat with pepper and salt. Sprinkle with cornstarch and toss meat to fully coat. Set aside.
In a skillet over medium high heat, add 2 Tablespoons oil.
Once oil is heated and shimmering, add garlic and ginger. Sauté for 1 minute. Add soy sauce, water, and brown sugar.
Bring to a boil then remove from heat. Carefully pour into a glass measuring cup or bowl.
Add remaining 2 Tablespoons oil to the skillet. Once oil is heated and shimmering, add meat. Brown on all sides, stirring often, for about 5 minutes total.
Once meat is browned, add sauce back and bring to a boil. Boil for 2-3 minutes, or until sauce is thick enough to coat the back of a spoon.
Serve with steamed rice and vegetables of choice.
Notes
Store leftovers in zip bags or an airtight container in the refrigerator for up to 4 days.
Store, in airtight containers, in the freezer for up to 4 months.