Garlic Green Beans with Crispy Ground Beef

Heat 1 tablespoon canola oil in a large flat-bottom wok or skillet over medium-high heat. Add beef and cook, breaking into large pieces with a wooden spoon, until well browned and crispy, 4 to 6 minutes. Sprinkle with 1/4 teaspoon salt, then transfer to a small bowl. 

Meanwhile, whisk vinegar, Shaoxing (or sherry), sesame oil, fish sauce, sugar and white pepper in a small bowl. Set next to the stove.

Heat the remaining 2 tablespoons canola oil in the pan. Add green beans and cook, stirring occasionally, until slightly charred and tender, 4 to 6 minutes. Add scallion whites, garlic and ginger; cook, stirring, until fragrant, about 1 minute. Add the vinegar mixture, reserved beef and remaining 1/4 teaspoon salt; cook, stirring, until well coated, about 1 minute. Serve sprinkled with scallion greens, if desired.