Add milk mixture and stir to form a pliable dough. Shape into smooth ball. Let dough rest for a few minutes to allow better handling. Place a spoonful of filling on each square. Fold one edge over to match the opposite and pinch together, dipping fingers in flour to prevent stickiness.
Place pockets on floured surface until ready to boil.
Bring to boil 3 L water with 1 tsp. Place pockets one by one into boiling water, about 8-10 at a time. Boil for 5 minutes or until pockets float all on top. Remove with slotted spoon. Drain and dot with butter or margarine.