Firstly rinse ½ cup moong lentils a couple of times in water. Then soak the lentils overnight or 6+hours. This is purely for leaching out antinutrients. But you can also soak moong lentils in hot water for 1- 2 hours , if you have no enough time.
Secondly drain all the water from soaked moong dal. Rinse soaked moong lentils in cold water couple of times . Drain water very well and add the soaked moong lentils in a mixing bowl.
Next add finely chopped cucumber, fresh grated coconut, coriander leaves and chopped green chili. Instead of green chilies, you can only use black pepper powder.
Add salt , pepper powder and squeeze some fresh lemon juice per your requirements.
Mix everything very well.
For Tempering Kosambari Salad
Heat 1 tablespoon oil in a small pan. Then add ½ teaspoon mustard seeds. Allow mustard seeds crackle. Keep the flame to a low. You can also add red chili in the tempering, if you wish.
Once the mustard seeds crackle, add ½ teaspoon cumin seeds , let it splutter. Add ¼ teaspoon of asafoetida.
Add 2 sprigs of curry leaves, stir and then switch off the flame.
Pour the tempering mixture on the salad. Mix very well.
Serve kosambari salad immediately.
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Notes
Always serve kosambari immediately because cucumber tends to release water when it comes in contact with salt. If planning to serve later, don't add salt . Keep ready salad in refrigerator and add salt just before serving.Kosambari has very short shelf life , so finish immediately or within 2-3 hours.