01 -
Slice the flank steak thinly against the grain and toss evenly with cornstarch until well coated.
02 -
Heat vegetable oil in a large skillet or wok over medium-high heat. Fry the beef in batches for 2 to 3 minutes per side until golden-brown. Transfer beef to a plate and set aside.
03 -
Reduce heat to medium. In the same skillet, sauté minced garlic and grated ginger for 30 seconds until aromatic.
04 -
Add soy sauce, water, and brown sugar to the skillet. Stir to combine and bring to a gentle simmer.
05 -
Cook the sauce for 3 to 4 minutes, stirring occasionally, until the mixture thickens. Stir in red pepper flakes to taste.
06 -
Return the seared beef to the skillet. Toss thoroughly to coat in the sauce and allow to simmer for 1 to 2 minutes until heated through.
07 -
Add sliced green onions and drizzle sesame oil over the beef. Stir to combine, then remove from heat.
08 -
Serve immediately over steamed white rice or your choice of noodles.