01 -
In a large heavy-bottomed stockpot, melt the butter over medium-high heat. Add the onions and sauté for about 30 minutes until caramelized, initially stirring every 3-5 minutes, then about once a minute near the end to prevent burning. Add garlic and sauté for 2 minutes. Stir in the flour and cook for an additional 1 minute.
02 -
Stir in the wine to deglaze the pan, using a wooden spoon to scrape up any browned bits on the bottom of the pan.
03 -
Add the stock, Worcestershire, bay leaf, and thyme and stir to combine. Continue to cook until the soup reaches a simmer. Then reduce heat to medium-low, cover and simmer for at least 10 minutes. Discard the bay leaf and sprigs of thyme. Season with salt and pepper to taste.
04 -
Preheat oven to 400°F. Slice the baguette into 1-inch thick pieces and arrange them in single layer on baking sheet. Bake for 6-8 minutes, until the bread is toasted and golden around the edges.
05 -
Switch oven to broiler. Place oven-safe bowls on a thick baking sheet. Ladle the soup into each bowl, top with a baguette slice and cheese. Broil 6 inches from heat for 2-4 minutes, until cheese is melted and bubbly. Serve immediately.