
This crispy sesame beef delivers tender slices of flank steak coated in a glossy sweet-savory sauce with plenty of toasted sesame flavor. It tastes like takeout, but the method is straightforward and perfect for serving over steamed rice on a busy night.
Place the sliced flank steak in a bowl. Add the water, cornstarch, Shaoxing wine, sesame oil, oyster sauce, and baking soda, then mix until the beef is evenly coated. Cover and marinate for 1 hour, or refrigerate overnight if preparing ahead.
While the beef marinates, make the sauce. In a bowl or large measuring cup, whisk together the hot water, brown sugar, light soy sauce, oyster sauce, sesame oil, rice vinegar, and white pepper until the sugar dissolves.
In a shallow dish, combine the cornstarch and toasted sesame seeds for the coating. Dredge each slice of beef until fully coated, then shake off any excess so the crust stays light and crisp.
Heat the neutral oil in a wok or large skillet over medium-high heat. When the oil is hot and a test piece of beef sizzles immediately, fry the beef in a single layer for about 1 minute per side, working in batches if needed. Transfer the cooked beef to a plate or sheet pan in a single layer to keep it crisp.
Let the oil settle, then carefully pour off the oil, leaving any sediment behind. Wipe out the pan, add 1 tablespoon of fresh oil, and cook the chopped garlic over medium heat for about 15 seconds, just until fragrant.
Pour in the prepared sauce and scrape up any browned bits from the pan. Bring the sauce to a gentle simmer, then add the scallions and cook briefly until softened.
Stir in the cornstarch slurry if using and cook just until the sauce lightly coats a spoon. Return the fried beef to the pan and toss quickly until evenly glazed. Serve immediately with steamed rice.
Slice the beef thinly against the grain for the most tender texture. Fry in batches so the pieces crisp instead of steaming. If Shaoxing wine is unavailable, dry sherry is a good substitute. Leftovers keep well in the refrigerator for up to 2 days, though the coating will soften over time.