Soak ker and sangri overnight or for at least 6–8 hours.
Rinse well and boil them until soft, then drain excess water.
Whisk yogurt with turmeric and red chili powder.
Heat oil in a pan and add cumin seeds.
Add the boiled ker and sangri, sauté for a few minutes.
Add the yogurt mixture slowly while stirring continuously.
Add water to create a thin, ras-like consistency.
Add salt and mix well.
Let it simmer for 10–12 minutes so flavors blend nicely.
Serve hot as a light curry or soup.