In a dutch oven or pot, melt butter over medium.
Add the leeks and carrots, and sauté over medium-high heat.
Stir a bit here and there for 10 minutes.
Leeks should be tender, not brown.
Add garlic for one minute.
Sprinkle on the Wondra flour and cook, stirring constantly, for 2 more minutes.
Add ½ cup of the sherry, the chicken stock, 4 teaspoons salt, 1½ teaspoons pepper, and the Parmesan rind.
Bring this up to a boil.
Then lower the heat and simmer, partially covered, for 20 minutes.
Add the chicken and heat for 5 minutes in the soup.
Remove from the heat and discard the rind.
Add the remaining ¼ cup sherry and the parsley.
Serve! Mmmm!