In a large bowl, mix the flour and salt. Make a well in the center and add the egg. Gradually add the warm water, mixing until a dough forms.
Knead the dough on a floured surface for about 5-7 minutes until smooth and elastic. Cover with a damp cloth and let it rest for 30 minutes.
In a bowl, combine the ground meat, chopped onion, ground cumin, black pepper, salt, and parsley or cilantro if using. Mix well.
On a floured surface, roll out the dough into a thin sheet. Cut into 3-inch (7.5 cm) squares.
Place a small spoonful of filling in the center of each dough square. Fold the edges over the filling to form a small package, pinching the edges together to seal tightly. You can also shape them into a round or crescent shape if desired.
Lightly grease a steamer rack or line it with parchment paper to prevent sticking.
Arrange the manti in a single layer on the steamer rack, making sure they are not touching each other. Steam over boiling water for about 25-30 minutes, or until the dough is cooked through and the filling is hot.
Enjoy your meal!