Meanwhile, cut the cauliflower into small florets and place in a large bowl. Then add the juice of one lemon, the olive oil, salt and pepper and stir well.
Then spread everything evenly on a baking sheet lined with baking paper and bake in the oven for 20 minutes.
After about 20 minutes, turn the cauliflower on the baking sheet and then bake for another 10 minutes on top / bottom heat. Then set the oven to the fan oven and finish baking for about 10 minutes.
If you like, you can now add chilli flakes to taste.