Combine all the ingredients for the Quiche Pastry in a mixing bowl until you have a soft dough.
Press a medium sized pie dish with quiche pastry and set aside.
In a saucepan, heat the butter and saute the leeks, garlic and mixed herbs until soft. Remove from heat and transfer these ingredients to a large mixing bowl.
Add the asparagus, cheese, egg and milk and mix until combined.
Pour the filling into the pie dish and bake at 180 degrees Celsius for 40 minutes until set and golden.