Season the pork neck with salt and pepper.
Heat oil in a pan and grill the pork neck until golden brown on both sides.
Boil the buckwheat noodles in boiling water, then rinse with cold water.
Place the noodles on a plate and top with the grilled pork neck.
Add julienned cucumber, carrot, and green onion.
Serve with soy sauce or ponzu sauce as desired.