Preheat the oven to 150°C/fan130°C/gas 2. Line a large baking tray with plenty of kitchen paper.
Pour the olive oil into a large saucepan or deep-fat fryer and heat to 190°C. To test the temperature, add a cube of bread to the pan. At 190°C, it will brown in 30 seconds.
Cut the squid pouches across into rings and separate the tentacles into pairs. Season the fish lightly with salt.