Preheat the oven to 150°C.
Using a larding needle or skewer, thread kitchen twine through the ends of both pork racks and tie together to form a crown. Rub all over with olive oil.
Grind the fennel seeds, sage, salt and pepper together and rub into the meat. Place on a rack in a large roasting tin and roast for 1 hour.
For the baked apples, cut off the tops and core the apples, keeping the tops aside.
Combine sultanas, butter, sage and honey, season well, and stuff the apples. Replace the tops and drizzle with honey.
Increase oven temperature to 180°C, add the apples to the roasting tin, and roast for another 30 minutes until golden and the pork reaches 160°C internal temperature.
Remove from the oven, rest for 20 minutes, cut off the string, and serve with the apples and pan juices.