Slow Cooked Turkey Shanks with Yogurt Sauce

Name: Slow Cooked Turkey Shanks with Yogurt Sauce
Ingredients: 2 onions, peeled & thickly sliced; 6 cloves garlic, cut in half; 50 g (1.7 ounces) speck, cut into 4 mm (0.5 cm) slices; 2 tbsp olive oil; 1 tsp dried oregano; 1 tbsp Greek yoghurt; Salt & black pepper; 2 turkey shanks, combined weight approx 1 kg (about 2 pounds); 1 tbsp dried red chili; 50 ml (1.7 fluid ounces) white wine; 50 ml (1.7 fluid ounces) verjuice; 300 g (10.5 ounces) kipfler potatoes, quartered lengthways; 60 g (2 ounces) green olives (about 16); 1 lemon, thickly sliced; Fresh parsley & more lemon, to garnish