1
In a large pot, heat oil and butter over medium heat. Add the thinly sliced onions and cook, stirring occasionally, for about 20 minutes.
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2
Add the sugar and cook another 20 minutes or until the onions are caramelized and golden brown.
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3
Add the vegetable broth, balsamic vinegar, bay leaf, dried thyme, salt, and pepper. Bring to a simmer and cook for 30 minutes.
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4
Place the baguette slices on a baking sheet and toast in the oven for about 8-10 minutes, until crispy and golden. Remove from the oven.
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