Vidalia Onion and Leek Soup with Pepato Cheese

Trim the leeks. Slice the white portion of the leeks and toss with the Vidalia onion slices. Reserve some sliced leek leaves for garnish. In a large heavy skillet, heat the olive oil and add butter until butter foam subsides. Add the onions and leeks and cook over low heat until onions are soft and begin to brown, about 10 minutes. Add the beer (or the 1 1/2 cups chicken stock) and cook until liquid is reduced by half. Add the 5 cups of stock and simmer 6 to 8 minutes. Season with salt and fresh ground black pepper. Ladle half the soup, a little at a time, into a blender or food processor and puree. Combine the pureed soup with the simmered soup and heat through. Ladle soup into bowls and top with bread slices. Place the Pepato slices on top of the bread slices and serve immediately.