In a large mixing bowl, combine the flour and salt. Make a well in the center and add the egg and water. Mix until a dough forms.
Turn the dough out onto a lightly floured surface and knead for about 10 minutes until smooth and elastic. Cover with a damp cloth and let it rest for 30 minutes.
In a bowl, combine the ground beef or lamb, finely chopped onion, minced garlic, ground cumin, ground paprika, salt, and pepper. Mix well until all ingredients are evenly distributed.
Divide the dough into two equal portions. On a lightly floured surface, roll out one portion of dough into a thin sheet, about 1/8 inch thick.
Cut the rolled-out dough into small squares, about 2 inches by 2 inches.
Place a small spoonful of the meat filling in the center of each dough square. Fold the edges of the dough over the filling to form a boat shape, pinching the corners to seal.
Preheat your oven to 375°F (190°C). Grease a baking sheet or baking dish with a little oil or butter.
Arrange the filled manti on the prepared baking sheet or dish. Bake in the preheated oven for about 20-25 minutes, or until the manti are golden brown.
In a bowl, combine the plain yogurt, minced garlic, and salt. Mix well and set aside.
In a small saucepan, melt the butter over medium heat. Add the grated tomato, tomato paste, ground paprika, salt, and pepper. Cook for about 5 minutes, stirring occasionally, until the sauce thickens.
Remove the manti from the oven and transfer to a serving platter. Drizzle the yogurt sauce and tomato sauce over the manti.
Garnish with freshly chopped parsley and sprinkle with ground sumac or red pepper flakes if desired.
Enjoy your meal!