For the Dough; combine the Flour, Salt, and Oil in a large bowl and use your finger to rub the Oil into the Flour until you get a crumbly texture. Stir in the Water about a tablespoon at a time until a soft and pliable dough then knead for about 7 to 10 minutes or till it's smooth and elastic. Then cover it up with a plastic wrap and allow it to rest or about 30 minutes.
Place the Dough back on a work surface and divide it into 6 parts then flour the work surface and roll out each part into a circle and at this point you can divide each circle into 4 and fill it with the stuffing but I like to go a step further by pre-cooking the sheets because it makes it easier to handle.
Preheat a heavy bottom pan/skillet then place the rolled out dough over it and cook the first side for about 10 to 15 seconds and the other side for about 5 to 10 second then remove it from heat.
Divide the pastry into 4 quarters and they are ready to be used.
For the filling; Add the boneless chicken part in a Pot together with some salt and Water and boil the chicken until it's tender.
Allow the chicken to cool for few minutes then blend it in a blender: don't add any Water to this while blending and just use the pulse button to blend (about 2 turns is fine) - please don't over blend!
Stir fry the Onion and Garlic in the oil until it's translucent then stir in the Chicken as well as the seasonings, Scallion and Spinach then remove from heat and leave to cool to room temperature.
Make a thick paste by mixing 2 Tablespoons of flour together with 3 to 4 Tablespoons of water and this will be used a glue for the pastry
Take each of the 'quartered circle' and apply the paste to the inner edge and outer edge of the pastry (please refer to video above if you need help with this) and seal it up then hold up the pastry like you would hold an ice cream cone (It should have a cone shape at this point) then fill it with about a tablespoon of filling but don't overfill.
Then apply the paste to the open end and seal it up.
Fry this in a preheated Oil of about 350 degrees Fahrenheit and fry both sides till golden brown.
This is best enjoyed while hot or warm.