INGREDIENTS
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1 tablespoon extra-virgin olive oil
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1/2 yellow onion, thinly sliced
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pinches salt
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1 tablespoon unsalted butter
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2 firm plums, pitted and thinly sliced
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1 teaspoon sugar
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1 cooked tart shell (recipe below or use store-bought)
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1 tablespoon mascarpone cheese
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1 teaspoon honey
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1 teaspoon balsamic vinegar
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1 tablespoon thinly sliced fresh basil
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1 cup all-purpose flour
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1/2 teaspoon salt
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8 tablespoons unsalted butter, chilled and cubed
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1/4 cup ice water
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1 egg