
This Chinese orange beef is crisp-tender, deeply savory, and coated in a glossy citrus sauce with just the right balance of sweetness and heat. Serve it with broccoli for a restaurant-style dinner that tastes bold, fragrant, and fresh from the wok.
Slice the flank steak against the grain into thin 2- to 3-inch pieces. In a medium bowl, combine the beef with 1 tbsp water, 2 tsp cornstarch, 2 tsp orange juice, 2 tsp vegetable oil, 1 tsp oyster sauce, 1/4 tsp baking soda, and a pinch of five-spice powder if using. Mix well and marinate for 1 hour.
Make the orange sauce. In a bowl, stir the warm water and sugar until dissolved. Add the orange marmalade, orange juice, light soy sauce, Shaoxing wine, sesame oil, and white pepper. Stir until smooth and set aside.
Place 1/4 cup cornstarch in a shallow dish. Dredge the marinated beef lightly just before frying, shaking off any excess so the coating stays thin and crisp.
Heat 1/3 cup vegetable oil in a wok over high heat until it is just beginning to smoke. Sear the beef in batches in a single layer for 45 seconds to 1 minute per side, until browned and lightly crisp. Transfer to a plate and repeat with the remaining beef.
Bring 4 cups water to a boil in a pot. Add the salt and 1/2 tbsp vegetable oil, then blanch the broccoli for about 45 seconds, or a little longer if you prefer it softer. Drain and arrange it around a serving plate, or reserve it to toss into the sauce later.
Carefully pour off excess oil from the wok, leaving about 1 tbsp behind. Reduce the heat to medium-low and add the ginger, dried red chilies, dried mandarin orange peel, and star anise. Stir-fry for 30 to 60 seconds until fragrant, then add the garlic and scallion and cook for 30 seconds more.
Pour in the prepared sauce and raise the heat to medium-high. Bring it to a simmer, then slowly stir in the cornstarch slurry. Cook until the sauce thickens enough to coat the back of a spoon.
Return the beef to the wok and toss until evenly coated. Add the broccoli now if you want it mixed into the sauce. Transfer to the serving plate and serve immediately.
If dried mandarin peel is unavailable, use a few strips of fresh orange zest for a brighter flavor, though the sauce will be less traditional. Fry the beef in small batches so it sears instead of steaming, and only coat it with cornstarch right before it hits the wok. Leftovers keep well in the refrigerator for up to 2 days, but the beef is crispiest when served fresh.