Step 1

Cook noodles according to package instructions. Drain noodles, reserving 1/3 cup cooking water in a small bowl. Run noodles under cold water to stop the cooking process; set noodles aside. Add oyster sauce and soy sauce to cooking water in bowl, and whisk together; set aside.

Step 2

Heat 1 tablespoon of the oil in a large skillet or wok over high. Add pork in an even layer, and cook, undisturbed, until browned and crispy, 6 to 8 minutes. Stir pork, and continuing cooking, stirring often, until cooked through, 2 to 3 minutes. Transfer pork to a plate. (No need to wipe out skillet.)

Step 3

Add celery and remaining 1 teaspoon oil to skillet, and cook over high, stirring occasionally, until tender and lightly charred, 2 to 3 minutes. Add garlic, and cook, stirring often, until fragrant, about 30 seconds. Add pork, noodles, and oyster sauce mixture to skillet. Cook, stirring often, combined and until heated through, 1 to 2 minutes. Garnish with celery leaves and, if desired, chili crisp.