Combine zucchini, carrots and potatoes, parsley, and coriander in a mixing bowl. Add salt, mix and leave it aside for 15 minutes.
After 15 minutes, the vegetables will release water.
Add the green chillies, cornflour, refined flour, rice flour, baking soda, chilli flakes and sesame seeds. Mix well.
On a medium hot pan, brush some oil.
Spread a thin layer of this mixture. Drizzle oil along the edges and on the surface, and pan-fry on medium heat.
Flip and pan-fry on the other side untill the rosti turns crispy.
Serve hot.