As I said last night I'm not really a soup kind of person. Though, now that I think about it I actually have become more of a soup person over the years. We make a green chili stew when it's not hotter'n the blazes - which here is like 2 months of the year - and I'll order pho over bun every day ... and we've been making this white bean and corn soup ... and we've been making crab and corn bisque ... I'm a soup guy? That doesn't line up with my self image. anywho ...
This is lifted from America's Test Kitchen
4lbs onion - yeah, seems like a lot ... it isn't
3 tbs butter cut into three slices
1/2 cup dry sherry
2 cups of water plus additional for deglazing
4 cups of chicken broth
2 cups of beef broth - I used better than broth - its my secret weapon for beefy magic flavor
4 sprigs of fresh thyme
1 bay leaf
Cut onions in half through the roots, and slice pole to pole in 1/4 inch slices. Preheat oven to 400˚. Put onions into a well oiled dutch oven, top with butter and a 1/4 tsp salt. Put dutch oven in oven covered for an hour. (their method has you then take the pot out of the oven and stir the onions, replace the pot in the oven with the lid cracked for another 1.5 to 1.75 hours- I just cranked up the heat on the burner and stirred the onions to keep them from burning. You're looking for the liquid to evaporate and for the pot to run dry. When a dark crust begins to form on the bottom of the pan add a quarter cup of water to deglaze the pan. Continue to run the pot dry several times until the onions are dark brown - but not burnt! - and are beginning to break apart. the last time you deglaze the pot use the 1/2 cup of dry sherry and cook until the liquid evaporates. Add the water, stock beef broth (or better than broth), bay leaf, and thyme stir to combine, and then bring to a boil and simmer for 30 minutes. Slice the baguette into thick slices and bake dry in the oven - drying these out will improve the crunchy texture of the crust when they're submerged into the soup - once dry top with shredded gruyere and broil until the cheese is bubbly and golden brown on top. Serve in a deep bowl with cheesy bread dunked into the bowl.
This was phenomenal. The hardest part is standing over the pot making sure the onions don't burn.