While the meat waits you can start on the sauce. Heat the 1 Tbsp of oil in a saucepan over medium heat. Add the garlic and ginger, and cook for about 30 seconds. (If you've never used ginger before, (I hadn't until the first time I tried this recipe), buy a very small piece. Slice off the skin on one side and use a cheese grater, on the very fine side, to grate the ginger. I have a picture below for you, the ginger is in the measuring spoons so you can see what it looks like. Once you've got all the ginger you need you can just leave it on the counter and the side you grated will 'heal' itself and grow the skin back. Awesome, I know).
Pour in the soy sauce, water, and brown sugar, and raise the heat to medium-high and cook for about 4 minutes. The sugar will desolve and the sauce should start to boil. Add the green onions and let it cook for another 30 seconds or so. Remove from heat and set aside. Isn't that color beautiful? Love it!