Slow Roast Spiced Lamb, Potato, and Mintchurri Yorkie Pie

Ingredients:  Lamb Shoulder, Red Onions, Garlic, Red Wine, Yukon Gold Potato, Turmeric, Coriander, Cumin, Cloves, Green Cardamom, Cinnamon, Star Anise, Mint, Parsley, Malt Vinegar, Brown Sugar, Red Chilli Flakes, Capers, Olive Oil, Salt, Pepper.  Short Crust Dough:  AP Flour, Butter, Shortening, Water, White Wine Vinegar, Salt