Prepare Dough: Mix flour, egg, olive oil, salt, and water. Knead 5–7 minutes until smooth. Cover and rest 30 minutes.
Make Filling: Heat olive oil, fry onions until golden, add garlic, then minced meat. Cook until browned. Add spices and fresh coriander. Let cool.
Shape Dumplings: Roll dough thin (2 mm). Cut into circles or squares. Place 1 tsp filling inside and seal edges tightly.
Steam Mantu: Grease steamer rack. Place dumplings inside without overcrowding. Steam 15-20 minutes until tender.
Make Yogurt Sauce: Mix yogurt, garlic, dried mint, and salt.
Make Tomato Sauce: Fry onion and garlic in oil, add tomatoes or paste with spices. Simmer until thick.
Serve: Place Mantu on a platter, top with tomato sauce, drizzle yogurt sauce, and garnish with dried mint or herbs.