In a small bowl, combine the sauce ingredients and set aside.
Start boiling water in a pot on the stove to prepare the noodles.
Meanwhile, in a wok or large frying pan on medium/high heat, add the oil and ground pork. Let the meat sear on one side before moving it around. Cook for about 3-5 minutes, until the pork is no longer pink and cooked through.
Push the meat to the side and add white and light green parts of green onion, ginger, and garlic. Cook for 30 seconds or until fragrant.
Stir in the sauce. Add water and let the sauce simmer for about 3-5 minutes.
Meanwhile prepare the noodles according to the package instructions and place them in individual bowls for serving.
In a small bowl, dissolve cornstarch with cold water to make a slurry. Create a well in the middle of the wok and stir in the slurry if you feel that the sauce needs thickening. Cook for 1 minute.
Spoon the meat sauce over the noodles. Top with cucumber and garnish with the remaining green onion.