1/4 cup (1/2 stick) unsalted butter 5 Leeks white and pale green parts only
chopped(about 3c) 1 Onion:
chopped 10 ounces Portobella mushrooms
chopped (about 4 :
generous cups) 1/4 cup All-purpose flour 3 cups Chicken stock or canned low-salt broth 4 tablespoons Dry Sherry 2 cups Half and half 1/4 teaspoon Cayenne pepper Ground white pepper Melt butter in heavy large Dutch oven over medium heat. Add leeks and onion; sa ut