Filling, Heat oil in pan, add ginger and garlic paste,onion and curry leaves.Stir in till onion transparents then add chicken. Stir well,once the chicken turn white,add potatoes.Cook for 2 minutes then add curry powder and salt. Mix all well,then add water and let the potato and chicken to cook. Cool completely before use.
Pastry, In large mixing bowl ,add flour, melted butter, salt.Mix well and keep aside. Now add water and knead to smooth dough.Wrap with wet cloths or plastic wrap and keep aside for 15 minutes.
Assemble, Divide the dough to small balls,and roll out each ball to circle and heaped with the filling in the center.Fold the pastry dough into half circle shape and pinch or seal the edges with fork.If u have mould ,then u can use it. Then deep fry in medium heat oil till light brown color.