This cauliflower and pear soup is elegant, sophisticated, and oh-so-chic! The flavor of the pear comes through as sweet but not sugary, and it blends with the cauliflower to create a delicious cream. Blending the soup until very smooth elevates it to dinner party status. I like serving it in consommé cups (those are the cups with two handles) and garnishing it with chopped chives just before serving. Similar to vichyssoise, this soup is delicious served hot or chilled. For an elegant dinner, follow the soup with beef Wellington and a combination of roasted baby vegetables, such as potatoes, carrots, and squash, and a chocolatey dessert.   Serves 4 4 tablespoons butter, salted   1 medium onion, diced (about 1 cup) 1 inch piece of ginger, peeled and diced (about 2 tablespoons)  1 large head cauliflower (2 1/2 pounds), leaves removed, cut into florets  2 ripe pears, cored and diced (about 3 …