This is an elegant, light, and smooth soup, with the look and texture of a velouté (cream soup) but not a drop of cream (there isn’t even a potato in it to thicken it). The recipe is from the wonderful cookbook, "Around My French Table", by Dorie Greenspan. It is delicious served it generously peppered and plain, but it’s a soup that welcomes embellishments, simple or lavish. For simple, consider drizzling the soup with a little walnut oil or dusting it with grated Parmesan or Comté. If you want to go lavish, top the soup with crème fraîche or, better still, crème fraîche and caviar — the slight saltiness of caviar is perfection with cauliflower. Or, if you’re lucky enough to have a truffle, shave it over the soup. STORING: The soup can be kept covered in the refrigerator for 3 days or, packed airtight, in the freezer for up to 2 months.