Put the pork belly in a pot and add 2 quarts water, the wine and the ginger. Bring the liquid to a boil, then turn the heat down to medium and gently boil the pork belly for 40 minutes, until tender.
Combine all the sauce ingredients in a small bowl and mix well.
Drain the pork belly and let it cool. When it has cooled somewhat but is still warm to the touch, cut it lengthwise into long 1/16-inch-thick strips. Arrange alternating and overlapping slices of pork and cucumber on a serving plate. Pour the sauce all over the pork and cucumber, and serve while still warm or at room temperature.