Heat oil in a pan on medium flame. Add cumin seeds, bay leaf, methi seeds, and cashews, and saute until cashews become light in color.
1 tsp Cumin seeds, 1 Bay leaf, ¼ tsp Methi seeds, 1 tbsp Cashews, 2 tbsp Vegetable oil
Add ginger, green chilies, and tomatoes, and saute until the tomato softens.
2 Green chilies, 1 inch Ginger, 2 to 3 Tomatoes
Add hing, turmeric powder, garam masala powder, red chile, amchur, coriander, and fennel powder, and mix well. Cook for a minute.
¼ tsp Asafoetida / Hing, ½ tsp Turmeric powder, ½ tsp Garam masala powder, 1 tsp Red chile powder, ¼ tsp Amchur powder, ½ tsp Coriander powder, ¼ tsp Fennel powder
Now add the mashed potatoes, water for desired consistency (approx 1 ½ to 2 cups), and salt and bring it to a nice boil.
Salt
Simmer it for 10 to 12 minutes. Garnish it with coriander leaves. Switch off the flame.
Coriander leaves
Serve hot with sabudana vada, dosa, poori, chapati, or paratha, and enjoy.