In a mixing bowl, grate 2 small boiled potatoes.
Add 1 tbsp green chili paste, salt to taste, 1 tsp cumin powder, ½ tsp black pepper powder, 2 tbsp curd, 1 tsp sugar, ½ tsp turmeric powder, 2 tbsp white sesame seeds, ½ cup chopped coriander leaves, and 1 tbsp oil. Mix well.
Add 2 cups rajgira flour and mix thoroughly.
Add 2-3 tbsp water and knead to form a soft dough for the thepla.
Pinch a medium-sized ball of dough, roll and flatten it. On a rolling board, roll out a thin thepla. Repeat with the remaining dough.
Heat a tawa and place the rolled thepla on it, cooking for a minute.
When the base is partly cooked, apply some oil or ghee and roast the thepla on a medium flame until fully cooked.
Serve farali thepla with batata sukhi bhaji and curd.