Soak channa dal for at least 20 minutes in warm water.
Heat oil in a pan, add mustard, cumin and curry leaves, allow them to splutter. Add hing.
Add tomatoes, salt and turmeric, fry till the tomatoes turn mushy.
Add the gourd, fry for 3 mins.
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Add dal, red chili powder, salt fry for 2 to 3 minutes. Pour water just enough to cook the dal. Cover and cook till the dal is just cooked thoroughly. Do not cook till the dal turns mushy. Or alternately can pressure cook for 1 whistle.
Add the grated coconut.
Add coriander leaves and Mix well and off the stove.Serve with roti.