Preheat the oven to 190°C/375°F.
Dry the cauliflower florets very thoroughly.
Zest the lemon.
Mix the lemon zest, cumin, curry powder, garlic powder, and cornstarch together, with a generous pinch of sea salt.
Add the spiced salt to the cauliflower, and rub it into well, making sure it is well coated in the spice powder.
In an oven-proof skillet, heat the oil over medium-high heat. Add the spiced cauliflower and fry for about 3-4 minutes until crispy on the underside. Turn, and fry for another 2 minutes, then transfer to the oven.
Roast for 18-20 minutes, until well-browned and deliciously crunchy-looking.
Squeeze over some lemon juice to taste, and serve hot, optionally with some dips on the side.