How to Make It
Step 1 Preheat oven to 550°F with oven rack in center of oven. Trim stem of cauliflower, keeping leaves intact, so it will sit level on a rimmed baking sheet. Bring 2 gallons water to a boil in a large stockpot over high. Stir in 61/2 tablespoons sel gris until dissolved.
Step 2 Add cauliflower to water; place a heatproof ceramic plate on top of cauliflower to keep it submerged. Boil until tender and a fork inserted in cauliflower meets no resistance, 12 to 13 minutes. Using a spider, gently lift