Sieve the chickpea flour and rice flour. Add them in a large bowl along with turmeric powder, salt, red chilli powder, asafoetida and carom seeds powder. Give a quick mix.
Heat 3 tsp of oil in a pan and add it to the flour mix. Now adding water little by little, mix the flour with all spices to make soft sticky dough.
Now take a lump of dough and fill it in to idiyappam press. Heat a heavy bottom wok adding cooking oil to deep fry the plain sev.
When the oil is heated enough (you can check it by dropping a pinch of plain sev dough, if it raises to the surface immediately then the oil is ready) press the plain sev directly in to oil in circular manner. You can press as concentric circles, if your wok is wide enough.
When the sizzling sound ceases, turn the sev to the other side and remove it from oil after few seconds.
Drain them on kitchen tissue. Repeat the process with rest of the dough. Let them cool down to room temperature, break them and store in airtight container.
Diwali snack Plain sev is ready, you can top it on upama, mixture, boondi and enjoy.