Prepare the Dough:
In a large mixing bowl, combine flour, egg, water, and salt. Knead until the dough is smooth and elastic. Cover with a damp cloth and let it rest for 30 minutes.
Make the Filling:
In a separate bowl, mix ground meat, grated onion, paprika, cumin, salt, and pepper until well combined.
Shape the Manti:
Roll out the dough thinly on a floured surface. Cut into small squares (about 1.5 cm x 1.5 cm).
Place a small amount of filling in the center of each square. Fold the corners to the center, pinching to seal.
Cook the Manti:
Bring a large pot of salted water to a boil. Add the dumplings and cook for 8-10 minutes, or until they float to the surface.
Prepare the Yogurt Sauce:
Mix yogurt, minced garlic, and salt in a small bowl. Set aside.
Make the Paprika Butter:
Melt butter in a small pan over low heat. Stir in paprika and remove from heat.
Assemble and Serve:
Arrange the cooked Manti on a serving plate. Drizzle with yogurt sauce and paprika butter. Garnish with chopped parsley and a sprinkle of sumac or chili flakes if desired.