Pressure-cook the mutton with three cups of water till four to five whistles. Drain the mutton pieces and keep the stock aside.
Dry roast the coriander seeds, cumin seeds, cinnamon, cloves, peppercorns and coconut till fragrant. Let it cool a little. Grind it to a fine paste with green chillies, garlic, lemon juice and a little water. Heat the oil in a deep non stick pan. Add the onions and sauté for two minutes.
Add the ground paste and mix. Add the boiled mutton, two cups water, potato cubes and salt and mix. Let it simmer. Mix whole wheat flour with half a cup of water well ensuring there are no lumps. Add it to the mutton and cook for ten to fifteen minutes. Serve hot with steamed rice or with appam or with neer dosa.