Combine 400 ml water, 40 ml sunflower oil, 45 ml vinegar, 25 g salt, and 1 egg in a large bowl.
Whisk the liquid ingredients together.
Add 1 kg of sifted flour gradually into the liquid.
Knead the mixture until you form a medium-stiff, hard dough.
Divide the dough into balls weighing roughly 100 g each (no bigger than your palm).
Place the dough balls onto a tray.
Cover the tray tightly with foil to prevent drying.
Rest the dough at room temperature for 30 minutes.