Boil the potatoes either in a pressure cooker or in a pot of boiling water. Once done, peel the skin and roughly chop them into cubes.
Puree the tomatoes and set aside.
Heat Oil in a Pan , add cumin seeds. Once they begin to sizzle add asafoetida, grated ginger. Saute for one minute and add the pureed tomatoes.
Add Turmeric Powder, Chilli Powder, Cumin Powder, approx 3/4 Tsp of Salt to the Tomato Puree. Saute for a min, cover and cook until it reduces and you see oil leaving the sides of the pan.
Add the roughly chopped potatoes along with water, stir and cook for another 10 minutes. Adjust the consistency by adding more water if needed. Sprinkle Garam masala and add coriander leaves.
Serve Hot Aloo Rasedar with Roti's , Poori's whatever you enjoy.