Cut beef thinly against the grain. Slices should be about 1/4 inch thick. Trim any large pieces of fat. Dab dry with paper towels. Set aside.
In a small bowl, whisk together flour, garlic powder, onion powder and fine sea salt.
Dredge beef slices in flour mixture, shaking off excess flour.
Heat vegetable oil in a large skillet. Working in batches so meat doesn't touch. Cook for 4-5 minutes or until strips are fully cooked and browned on all sides. Remove to a plate and continue with remaining beef.
In the same skillet, add white onion minced garlic and grated ginger, softening for 1-2 minutes.
Add water, soy sauce and brown sugar, stirring until combined and sugar has dissolved. Bring to a low simmer.
Add cooked beef back to the sauce, lowering heat to low. Toss in sauce until it starts to thicken. Add scallions before serving.
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