"souper" simple French Onion Soup

Ingredients:

1 stick unsalted butter
5 medium sweet onions, sliced
2 cartons Beef Stock (not broth!) *I used one salted and one unsalted
2 tablespoons dry Sherry 
1 tsp. dried thyme
salt & pepper, to taste
French Baguette (sliced and toasted)
Grated Cheese!  (any or all of these!)
--Provolone
--Swiss
--Parmesan
(I used all three and LOTS of them!)

Directions:

Melt butter in a large stock pot over low heat.
Add onions and cook slowly, stirring often, until softened.  Don't brown!
Add the beef stock, sherry, thyme and season with salt and pepper.
Simmer at least 45 minutes. (the longer the better!)

Preheat the broiler.
Line a baking sheet with foil.
Using oven safe bowls, put some shredded cheese into bottom of bowl.
Fill bowl with soup, leaving room for the bread and more cheese on top.
Lay the bread on top of the soup and cover with more cheese--lots!!!
Put baking sheet with soup bowls under the broiler until cheese is bubbly and browned.

Enjoy!!!