Heat oil in a pan. Add cumin seeds and let it splutter.
Add chopped ginger, green chillies and all spices. Stir for 10 - 15 seconds.
Add whisked curd to the pan and stir continuously.
Stir until it starts to boil. Then add diced and roughly mashed potatoes.
Season with salt and simmer for 5 minutes on medium flame.
Turn off heat. Garnish with fresh coriander leaves.
Dahi Aloo is ready to serve.
Notes
If you are not making for fasting or vrat recipe, then add crushed kasuri methi (dried fenugreek leaves) and a pinch of garam masala.For Vrat recipe use rock salt in sted of normal iodised salt.If any spice (turmeric powder / hing/ red chilli powder / coriander powder ) is not allowed at your place then skip that.