What’s the science behind thenkuzhal (its a crispy snack, crispy hollow tubes)?

Question

How/why does the hollow form inside this crispy snack? It is made from rice flour dough. For more details please check https://kalaskalai.wordpress.com/2015/12/20/thaenkuzhal-murukku/

Max · Answer

I think the hollow comes from air expanding while frying the dough.
At first I thought it was made like an Italian bucatini (with a die), but watching videos showing how Thaenkuzhal is made, I think it's only air expanding

What’s the science behind thenkuzhal (its a crispy snack, crispy hollow tubes)?

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