1: Begin by removing any leaves from the romanesco then separate the small florets, as shown in this video.
2: Wash the florets by soaking them in a large quantity of cold water with 1 tablespoon white (spirit) vinegar.
3: Bring a large pan of salted water to the boil, then plunge the romanesco florets into the pan and cook for just 2 or 3 minutes. They should still be slightly crunchy.
4: Remove the florets from the pan with a spider and plunge them into very cold water to stop the cooking.
5: Drain the florets then dry them more thoroughly in a salad spinner.
6: Your romanesco is now ready for use in a recipe.