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1
Preheat the oven to 350u00b0F/180u00b0C/gas 4. Spread the bread cubes on a dry (not oiled) baking sheet. Toast the bread until dry throughout, but not browned, about 15 minutes. Set aside.
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2
Combine the confit and broth in a large pan over medium heat. When the soup shows small bubbles, decrease the heat to low and let it simmer for at least 10 minutes. Taste and season with a pinch of salt and a few grinds of pepper (keeping in mind that the cheese contains salt, too).
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3
For each serving, drop a handful of toasted bread cubes into an empty soup bowl. Sprinkle the grated cheese over the bread. Stir the sherry vinegar into the soup, and then ladle the soup over the bread and cheese in each bowl. Finish with a sprinkling of parsley, if you like. Serve right away.
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4
In a large saute pan, heat the olive oil and butter over medium heat. When the butter is bubbling, add the onions to the pan. Cook, stirring often, until the onions begin to appear translucent, about 8 minutes. Add the garlic and thyme and cook, stirring constantly, until the onions and garlic begin to show some color, about 5 minutes. Don't let the garlic become too dark or it will give your confit a scorched flavor.
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5
When the onions are soft and show a good amount of brown, deglaze the pan with the sherry, scraping the browned bits from the pan's bottom with a wooden spoon. Cook until the liquid is almost all evaporated from the pan, and then stir in the sherry vinegar and take the pan off the heat.
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6
This confit will keep for up to 3 days covered in the fridge, but the flavor becomes a little less bright every day. Some people store confit in the freezer; we don't because we don't like how freezing affects the onions' texture.
