Put the mince in a large bowl and add the garlic, ginger, chopped tomatoes, pine nuts, garam masala, cumin powder, lemon juice, salt and pepper. In a food processor, grind the onion with the coriander and chilli to form a paste. Add this mixture into the mince and mix until fully combined. Cover and set aside for 10 minutes so that the flavours are infused.
Preheat the oven at 200 C.
Fill each pita quarter with about 2 tbsp of the mince mixture, making sure to flatten it out so that the filling is evenly spread inside the pita pocket. Do not be tempted to over-fill as that would leave the mixture raw in the centre.
Brush each piece on both sides with a little olive oil, then arrange the filled pita quarters on a lightly oiled baking sheet. Bake for 10 mins then turn them over and bake for an additional 10 minutes until the pitas are browned and crispy.
Serve with a drink of your choice.