In a bowl, mix together warm milk, yeast, egg, sugar, salt, and oil. Mix everything together till well combined. Add flour little by little to make a soft dough. You may need a ¼ cup more or less of flour while kneading the dough.
Keep the dough covered in a warm place to rise and double in size.
To make the topping: Heat oil in a pan and fry garlic and onion until soft. Then add mince, cumin powder, black pepper powder, lemon juice, and salt. Cook till mince is fully done. Set aside and cool.
Add chopped tomatoes, chopped coriander leaves and chopped mint leaves to the mince mixture and mix well.
Pre-heat oven to 200 degrees C.
Place the dough on a floured surface and divide into two parts. Take each part and roll out into a large rectangle roti.
Evenly spread 3 to 4 tbsp. mince topping on the rolled out dough and fold the sides to give a shape of a boat.
Sprinkle a handful of grated mozzarella cheese on the mince topping.
Brush the sides of the pide with whisked egg and pour the remaining whisked egg on the cheese.
Bake the pie for 15 to 20 minutes.
Cut into slices and serve hot.