Preheat the oven to 180C / 350F and line a small baking tray with foil. Season the duck breasts well with salt and pepper on both sides and then place the fat side up on the tray. Drizzle the honey over the duck and then add the 5 spice.
Roast for 20-25 minutes until golden brown. Baste once or twice with the honeyed fat during the roasting.
While the duck is roasting make your plum sauce. Add all the ingredients to a medium pot and simmer for around 15 minutes with the lid on. Remove the lid and allow to cool slightly and then blend with a stick blender until smooth.
To make the pancakes mix the 5 spice and the finely chopped spring onions with the flour and then add the boiling water. Knead this dough on a lightly floured surface for around 8 minutes and until it's soft and springy to the touch. Keep adding a little flour if it gets sticky.
Cut the dough into 16 even pieces and roll into balls. Using a rolling pin, lightly flour the surface and roll each ball out as thin as possible. Heat a non-stick skillet to high heat.
Fry the pancakes for 20-30 seconds on each side. Remove before they become brown (they will turn white and start to bubble slightly). Set aside.
When the duck has roasted set it aside to rest for a few minutes and then slice it into thin strips against the grain, season well with salt, and serve with the pancakes, plum sauce, cucumber, and spring onions.