Take 1 medium-sized raw potato and grate it using the small holes of a grater. Wash the grated potato to remove the excess starch, then squeeze out all the water.
Heat 2 tbsp oil in a pan. Add ½ tsp cumin seeds, 1 tsp sesame seeds, and 1 tbsp ginger-green chilli paste. Sauté for a few seconds until aromatic.
Add 1 cup grated potato and sauté for 2–3 minutes.
Pour in 1½ cups water and mix well.
When the water comes to a boil, add salt, ½ tsp red chilli flakes, ¼ tsp black pepper powder, and 1 tbsp lemon juice. Mix well.
Add 1 cup suji (rava) and stir continuously until well combined.
Once the mixture absorbs all the water, cook it until it leaves the sides of the pan.
Transfer the mixture to a mixing bowl and let it cool slightly. Then add ½ cup rice flour and mix well to form a soft dough.
Grease your hands with a little oil. Take a small portion of the dough, roll it between your palms, and shape it into a heart. Repeat with the remaining dough.
Heat oil in a pan. Carefully add the nashta and fry over medium-high heat until golden brown and crispy on both sides.
Crispy Suji Nashta is ready. Serve hot with tomato ketchup.