Ingredients
Method
- Slice the flank steak into 1/4-inch strips against the grain. Dip each strip in beaten egg, then dredge in the 1/2 cup cornstarch until fully coated. Set aside on a plate.
- Heat the 1/2 cup vegetable oil in a large skillet over medium-high heat until shimmering. Fry the beef in 2 to 3 batches, 2 to 3 minutes per side until golden and crispy. Drain on a paper towel-lined plate.
- In a small bowl, whisk together the 3 tbsp soy sauce, 3 tbsp rice vinegar, 3 tbsp brown sugar, 2 tbsp tomato paste, 1 tbsp hoisin sauce, 1 tbsp water, and 2 tsp cornstarch until smooth.
- Pour off all but 1 tbsp oil from the pan. Cook the 1/2 onion wedges for 2 minutes, then add the 1 red bell pepper, 3 cloves minced garlic, and 1 tsp chili flakes and cook 1 to 2 minutes more.
- Pour the sauce into the pan and stir for 30 seconds until glossy and thick. Add the beef and toss for 1 minute. Remove from heat, drizzle with the 1 tsp sesame oil, toss once more, and serve on a plate with vegetables on top.
Notes
You can slice and coat the beef up to an hour ahead and leave it uncovered in the fridge; the cornstarch coating will dry out slightly and actually fry up crispier. If your sauce seems to tighten before the beef is coated, add a splash of water, about 1 tbsp, and stir quickly over medium heat. Flank steak is worth seeking out here; it has the right grain structure to slice thin and stay tender under the heat.
