Combine flour, chicken egg, butter and boiled water in a bowl. Knead the dough.
For the filling, combine the minced meat, spices and chopped onion. Stir.
Roll out the dough into a large layer. Spread the filling around the perimeter of the entire layer in an even layer.
Roll the dough with the filling into a rope. Cook in a steamer until done, about 20-25 minutes.