In a deep pan, whisk yogurt, water and chickpea flour to make a smooth batter making sure there are no lumps. Add salt, sugar and turmeric powder to it and bring it to a boil. Once done, lower the heat, add grated ginger and let it simmer for 10 minutes. If you wish to thicken the soup more, continue cooking for 5 more minutes. Keep stirring in between. Once done, switch off the heat and keep the pan aside.

Heat another small pan, pour ghee/clarified butter in it and bring it to medium heat. Add asafoetida, chopped green chili, mustard seeds and curry leaves. It will splatter, so be very careful. After a couple of seconds, switch off the heat and pour the hot ghee straight in the soup. It will sizzle. Give the soup a mix and serve it either warm or at room temperature.