Heat the oil in a pan , add all the ingredients and sauté on a medium flame for 2 to 3 minutes. Keep aside.
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When cool blend in a mixer to a smooth paste, adding little water if required.
Soak the cashew nuts in ¾ cup of water for half an hour and drain.
Heat a tsp of oil in a pan and fry the ground masala paste with a little water till the oil separates from the masala.
Add the drumstick, red pumpkin and brinjal pieces and the soaked cashew nuts and mix well.
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Cover and cook on a low flame for 15 minutes till the vegetables are almost cooked and the water has dried up.
Add coconut milk and bring to a boil.
For the tempering, heat the oil in a small pan and add the mustard seeds and curry leaves.
When they crackle, pour the tempering over the curry.
Serve hot with steamed rice.