Thin beef and bok choy need high heat and a short cook. This skillet sears the steak, chars the greens, then glazes everything in soy, ginger, and a touch of oyster sauce.
Rice on the side soaks up the sauce. About 25 minutes if you slice the beef thin.
Ingredients
Beef and sauce
- 1 lb (454 g) flank or sirloin steak, sliced thin against the grain
- 1 Tbsp (15 ml) low-sodium soy sauce (for marinade)
- 1 tsp cornstarch
- 1 Tbsp (15 ml) neutral oil, divided
- 1 lb (454 g) baby bok choy, halved lengthwise
- 3 garlic cloves, minced
- 1 Tbsp (8 g) grated fresh ginger
- 3 Tbsp (45 ml) low-sodium soy sauce
- 1 Tbsp (15 ml) oyster sauce or hoisin
- 1 Tbsp (15 ml) brown sugar or honey
- 1 Tbsp (15 ml) rice vinegar
- 2 Tbsp (30 ml) water
- 1 tsp toasted sesame oil
- 2 green onions, sliced
- Cooked rice, for serving
Method
- Toss steak with 1 Tbsp soy sauce and cornstarch; rest 10 minutes while you prep. Whisk remaining soy sauce, oyster sauce, brown sugar, rice vinegar, water, and sesame oil.
- Heat 1/2 Tbsp oil in a 12-inch skillet over high heat. Sear beef in a single layer 1–2 minutes per side until browned but still pink; transfer to a plate. Work in batches if needed.
- Add remaining oil. Place bok choy cut-side down; sear 2 minutes, then toss 1–2 minutes until leaves wilt and stems are crisp-tender. Push aside.
- Add garlic and ginger 30 seconds. Return beef. Pour in sauce; toss 30–60 seconds until glossy.
- Scatter green onions. Serve over rice.
Cook's note
Freeze the steak 15 minutes for easier thin slicing. High heat is non-negotiable — a lukewarm pan stews the beef.
What to serve with it
Steamed rice or noodles. Chili crisp and extra green onions at the table.
Make-ahead and leftovers
Slice beef and whisk sauce up to 8 hours ahead; refrigerate separately. Leftovers keep 3 days; reheat hot and fast. Freezing cooked bok choy turns it mushy.
Troubleshooting
**Beef chewy?** Slice thinner against the grain and sear hotter. **Sauce bland?** Finish with a pinch of salt or splash of soy. **Bok choy watery?** Sear cut-side down first to drive off moisture.