Vichysoisse (pronouned vi-shee-swaaz) is a French chilled soup made of mostly leeks and potatoes. I came across this dish when my monthly Supper Club theme was French, and I was assigned to the soup & salad course. I didn’t want to go the obvious route with French Onion Soup. Don’t get me wrong. It’s quite tasty, and I appreciate the cheesy goodness that tops it. But I wanted something different, something they wouldn’t expect. After a quick Google search, I discovered Vichyssoise.