Prepare the leaves. Wash the colocasia leaves and remove the stalks and tougher veins. Save the stalks for Dant da Kajipu. Soak the prepared leaves in water with a little turmeric, then drain and leave them for around 2 hours to wilt slightly. They should become limp enough to roll without tearing.
Make the leaf knots. Roll each softened leaf into a narrow length and gently tie it into a knot. For a visual guide, see my linked reel. Measure 1½ cups of the prepared knots.
Cook the knots. Place them in a pot with water, a little tamarind and salt. Boil until the leaves are thoroughly cooked and tender, including the centre of each knot. Keep the knots aside.
Cook the moong and ambade. Lightly pound the hog plums. Pressure-cook them with the sprouted moong and enough water for one whistle, then allow the pressure to release before opening. Check that the moong is tender and cook further if needed. Reserve its cooking water.
Grind the coconut masala. Grind the fresh coconut, Byadgi chillies, tamarind, cumin, coriander and turmeric into a fine paste, adding only enough water to help the mixer along.
Make the tempering. Heat the coconut oil in a pot. Add the mustard seeds and let them splutter, then add the curry leaves.
Bring the curry together. Pour in the ground masala and add salt. Stir in the cooked moong, leaf knots and hog plums. Thin the curry with the moong cooking water or fresh water until it reaches the consistency you like.
Boil and simmer. Bring everything to a boil, then simmer gently for a few minutes until the masala is cooked through and the flavours come together. Taste and adjust the seasoning. Stir gently to keep the knots intact.
Serve. Enjoy with rice as part of a leaf lunch, or with Kottiges.