Cook 4 sliced onions and 2 thyme sprigs in butter, covered, 20 minutes. Uncover; cook 1 hour, or until caramelized, stirring occasionally. Add 6 cups beef broth; simmer 10 minutes. Add cognac, salt and pepper. Top with gruyere toasts.
taken from http://www.foodnetwork.com/
on Oct. 12, 2012 at 1:34 PM