"Cipollini onions are perfect for these tarts because they are small, flat, and sweet. You can also substitute shallots. You will need a mini-muffin tin...."
INGREDIENTS
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All-purpose flour, for dusting
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(Pie Dough) Pate Brisee
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3 tablespoons butter
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6 tablespoons sugar
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12 cipollini onions, peeled
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Salt and freshly ground black pepper
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1 tablespoon balsamic vinegar
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2 sprigs fresh thyme