Cut200g (7oz) firm tofu into 1.5cm (⅝inch) cubes. Drain on paper towel for 10 minutes to get rid of any excess liquid. Flip the tofu and replace the paper towel.
Heat150ml (5fl oz) sunflower oil in a saucepan over medium heat. When the oil reaches 180°C (350°F), fry the tofu for 2 minutes. Scoop out the crispy tofu using a slotted spoon. Drain on paper towel.
Sprinkle the tofu with sea salt. Serve it as a snack or serve with a salad as croutons.