Get a bowl and add Besan, Rice Flour, Red Chili Powder, Turmeric Powder, Sesame Seeds, and Salt to it.
Mix it well.
Add Water to this mixture and prepare a smooth batter. Keep it aside for sometime.
Heat a pan on medium flame.
Once the pan turns hot enough, add Oil to it.
As the Oil turns hot, add the Asafoetida and Mustard seeds.
Once you hear the crackling sound, add the Cumin Seeds.
Now, add the chopped Ginger and chopped Garlic to it. Sauté them for a minute or two.
Add the chopped Coriander Leaves and stir fry it for 3-4 minutes.
Finally, add the prepared Batter to it and mix everything well. Cook this mixture till it turns thick enough.
Meanwhile, grease a plate or mold with some Oil.
Add the cooked Zunka Vadi mixture to this plate and spread it evenly. Sprinkle some leftover Sesame seeds on top of it. Let it set on room temperature for about an hour or so.
Cut the set mixture into square shapes (Vadis).