Preheat oven to 475°F.
In a Dutch oven, add wine, stock, 1/4 cup EVOO, salt, lemon juice, butter, chili flakes and bay leaves in a pot, and bring to a boil. Add the whole cauliflower and partially cover; reduce heat a bit and cook 15 minutes to soften. Remove the cauliflower with a spider or 2 spatulas to a rimmed baking sheet. Place cauliflower in center rack of oven and roast for about 30 minutes until deeply golden in color. Drizzle with more EVOO and season with flaky sea salt.