Heat 2 tablespoons oil in a large pan. Add the onion and fry until translucent
Add the garlic and fry for a minute. Add the chilli powder, turmeric, cumin, coriander and garam masala. Fry for a minute. Add a few drops of water if required
Add the butter and the flour and whisk until the butter is melted. Add the stock, little bits at a time and mix well
Simmer until it starts to thicken, about 3-4 minutes. Doesn't have to be too thick as it will thicken more once cool
Add the chicken and vegetable to the sauce. Season with more salt and some pepper
Fill the pastry cases with the chicken filling. Roll out the remaining pastry and cut into 8 rounds. Beat the egg and brush the edges of the pastry with it. Place one on top of each pie
Brush the tops of the pies with the egg wash and sprinkle some sesame seeds on top
Bake at 180 degrees Celsius for 35 minutes or until pies are crisp and slightly brown