Preheat the oven to 325°F (165°C). Season the pork generously with salt and pepper.
Heat the olive oil and sear the pork on all sides until deeply browned, about 8 to 10 minutes. Remove and set aside.
Add the sliced onion and cook 3 to 4 minutes until softened. Add the garlic and cook 1 minute more.
Return the pork to the pot. Add the cider and bay leaf. Bring to a simmer, cover, and transfer to the oven.
Braise 1 hour 30 minutes, then add the turnips and apples. Cover and braise 30 more minutes, until the pork shreds easily.
Shred the pork with two forks, discarding large pieces of fat. Toss back into the pot with the turnips, apples, and liquid.
Warm the tortillas in a dry skillet or over a low flame.
Fill each tortilla with the pork mixture, top with cabbage, yogurt, and parsley, then wrap and serve.