Cut off both tips of the cucumber. Peel the skin. Halve the cucumber lengthwise. Scoop the seeds out with a spoon
Cut the cucumber on a bias into a 1/2-inch thick pieces
Marinate the meat:
Combine pork slices with all the ingredients for marinade. Let them marinate for at least 15 minutes up to 12 hours
Stir-frying:
Preheat a wok or large skillet over high heat until you start seeing smoke arise. Add 1 Tbsp of oil and swirl to coat the wok/skillet. Add the pork in one layer. Let the pork cook undisturbed for about 30 seconds then stir fry for another 30 seconds. Some parts will get a slight char. Remove from the wok/skillet.
Wipe the wok or skillet or scrape off any pieces that may stuck there. Add another 1 Tbsp of oil. Add the garlic, ginger, and scallion and cook for about 30 seconds.
Add the cucumber slices and cook for another 30 seconds
Add the pork back followed by the seasoning and stir fry to mix everything. Pour the cornstarch slurry and continue to stir fry. There isn't much sauce in this stir fry, but the cornstarch slurry will make everything smooth and shiny.
Serve:
Remove from the heat and serve immediately with some rice or as part of multi-course meal