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Tie 2 bay leaves and a few sprigs of fresh thyme and a couple of stalks of parsley together with kitchen string and set aside.
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Melt butter in saucepan.
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Add onions along with the tied herbs.
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Stir and cook over medium heat for about 45 minutes.
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Onions will cook down in volume.
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Add sugar and cook another 10 minutes.
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Add garlic and continue to cook until onions are well-browned.
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Once onions are browned remove and discard herb bouquet.
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Add white wine and cognac.
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Simmer for another 10-15 minutes.
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Sample and add salt or other seasonings to taste.
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Slice french baguette and bake for 10 minutes until bread is crisp.
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Remove bread and set aside.
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Set oven to grill (or broil).
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Ladle soup into heat-resistant soup bowls (as needed).
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Add bread slices to top of soup bowls.
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Sprinkle with grated Gruyere cheese.
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Bake until cheese is slightly browned.
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Serve right away.
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Freeze leftover soup without cheese or bread.