This sweet potato soup, given a hint of yeastiness with the addition of Belgian-style beer, could take on several roles at Thanksgiving. It may be your first course, one that’s deeply flavored but not dense and heavy. Or you could ladle it into small cups for guests to sip as an hors d’oeuvre before they are seated. And it provides a reason to skip the sweet potato casserole topped with marshmallows. (Though it is a tradition in many households, it’s not a favorite of mine — but I did give it a shout-out by garnishing the soup with lightly toasted mini-marshmallows.) Regardless of how you serve this silken soup, be assured that it’s light enough to welcome a white wine, yet rich enough to pair with red