Dry roast the Sichuan peppercorns in an oil-free pan until fragrant. Cool a bit then grind (a mortar and pestle is useful).
Place the pork in a bowl. Add the ground Sichuan peppercorns, five-spice powder and salt. Mix well.
Heat the cooking oil in a wok, swirling to thinly coat as much of the cooking surface as possible.
Add the pork and cook over high heat, stirring occasionally, until lightly browned.
Add the ginger and star anise. Continue cooking until the pork acquires a deeper color.
Pour in the broth. Bring to the boil. Lower the heat, cover and simmer for 30 to 35 minutes or until the pork is tender and most of the liquid has been absorbed. Note that you’ll need about a quarter cup of liquid in the pan to make the sticky sauce.
Scoop out the pork and transfer to a plate or bowl. Keep hot.
To the remaining liquid in the pan, add the soy sauce, honey and rice vinegar. Cook over high heat until reduced, thick and sticky. Watch the sauce closely as there is a very small window between sticky and burnt.
Turn off the heat. Add the pork to the sauce. Drizzle in the sesame seed oil. Toss to coat every piece of pork with sauce.
Tip the contents of the pan onto a serving plate. Sprinkle the sticky Szechuan pork with toasted sesame seeds and snipped scallions before serving.