Shish barak (Meat dumplings in yoghurt sauce)

Name: Shish barak (Meat dumplings in yoghurt sauce)
Prep time: 40 min
Cook time: 1 h 30 min
Total time: 1 h 30 min
Yield: 6 portions
Ingredients: 150 g plain flour; 75 g full cream milk; 25 g vegetable oil; 4 pinches salt; 50 g brown onion; 100 g beef mince; 2 - 3 pinches Baharat spice mix; 2 pinches ground cinnamon; 2 pinches nutmeg; 2 pinches ground white pepper; 20 sprigs fresh mint; 3 garlic cloves; 20 g olive oil; 1500 g natural yoghurt; 1 tbsp cornflour; 1 pinch salt; plain flour