Make the dough: Mix flour and salt. Add the egg and oil, then gradually add water and knead until a smooth dough forms. Cover and let it rest for about 20-30 minutes.
Prepare the filling: Mix the ground meat with chopped onions, garlic, coriander, black pepper, turmeric, and salt. Add cilantro or chili if desired.
Roll the dough: Divide the dough into small portions and roll each one into a thin sheet. Cut into small squares.
Fill the dumplings: Place a small amount of meat filling in the center of each dough square. Fold and seal the edges carefully.
Steam the mantu: Place the dumplings in a lightly oiled steamer basket, leaving a little space between them. Steam until the dough is tender and the meat is fully cooked, about 25-30 minutes.
Make the yogurt sauce: Mix plain yogurt with minced garlic, dried mint, and a pinch of salt.
Make the tomato sauce: Sauté the onion and garlic in oil. Add tomatoes, turmeric, salt, and pepper. Simmer until the sauce thickens. Add cooked lentils if desired.
Serve: Arrange the steamed Mantu on a serving plate. Top with garlic yogurt and tomato sauce, then garnish with fresh cilantro or dried mint.
Notes