After clean the squid:
Slide the squid horizontally like the picture above.
Remove the soft bone
3- 將有骨那面輕輕用刀戒花, 可以令魷魚捲曲, 相反則可以令魷魚不會捲
Make the cross gently with a knife on the surface. Making it on the surface with the soft bone will make the squid curling after cook. In the other way, will make it flat after cook.