Beef and sweet potato stir-fry
Instructions:
- In wok or large skillet, heat 1 tbsp of the vegetable oil over high heat; stir-fry beef, in 2 batches, until browned but still pink inside, about 2 minutes. Transfer to plate. Drain fat from pan.
- Add remaining vegetable oil to pan; stir-fry sliced onion and minced garlic over medium heat until onion is softened, about 2 minutes.
- Stir in sweet potato, yellow pepper and 1⁄2 cup water; cover and steam until potatoes are tender, about 10 minutes.
- Meanwhile, in small bowl, whisk together beef stock, oyster sauce, cornstarch, vinegar and sesame oil. Return beef and any juices to pan. Add oyster sauce mixture and bring to boil; boil, stirring, until thickened and glossy, about 1 minute. Sprinkle with green onions.