In a pan, add 1 cup sabudana and roast it on low flame for 2 minutes. Roast until the sabudana becomes slightly crispy. Transfer it to a plate and let it cool slightly.
In a mixer jar, add the roasted sabudana and ¼ cup sama rice. Grind into a fine powder.
Sieve the ground powder into a mixing bowl. Add 1 cup (or 2 medium-sized) boiled and mashed potatoes, 1 tbsp ginger-green chilli paste, salt to taste, ½ tsp cumin seeds, and ¼ cup chopped coriander leaves. Mix well.
Gradually add ½ cup water, or as required, and knead into a soft dough.
Cover the dough and let it rest for 5 minutes. Do not rest the dough for longer, as it may become difficult to roll.
Take a small portion of the dough, roll it into a smooth ball, and flatten it into a disc.
Sprinkle some dry farali flour and roll the disc into a medium-sized circle.
Heat a tawa over medium heat. Once hot, place the rolled roti on the tawa and cook on medium flame until both sides are properly cooked.
Apply some ghee over the cooked roti.
Repeat the process with the remaining dough.
Place the cooked rotis in an insulated container to keep them soft and warm.
Serve Farali Roti with Batata Suki Bhaji and Peanut-Green Chilli Chutney.