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2 tablespoons extra-virgin olive oil
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1 small onion, thinly sliced
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Salt
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1/4 cup water
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8 Crostini Toasts
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2 ounces Taleggio or Reblochon cheese, cut into 8 thin slices
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Heat the olive oil in a medium skillet. Add the onion, season with salt and cook over moderate heat, stirring, until it begins to brown, about 8 minutes. Add the water and cook until it has evaporated and the onion is very tender and caramelized, about 10 minutes. Season with salt and let cool.
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Preheat the oven to 350°. Arrange the Crostini Toasts on a baking sheet and top each with a slice of cheese. Bake for about 4 minutes, or just until the cheese melts. Top with the caramelized onion and serve.
Make Ahead
The caramelized onion can be refrigerated for up to 5 days. Let the onion return to room temperature before using it.