We always make mor kuzhambu during important festivals / pandigai (as called in Tamil). One of the easiest recipes of South India and one of my favourite too. Mor Kuzhambu is generally made with paruppu urundai or dried salty sundakkai with white pumpkin or okra (bhindi). My husband likes it with yellow pumpkin for the sweet, sour and salty taste. Here is the recipe with Keera Paruppu Urundai. I took the recipe from here. You can replace spinach with any greens. I normally soak all the dals for a minimum of 6 – 8 hours as soaked dals digest faster.