"The pastry shells can be made in advance and stored at room temperature...."
INGREDIENTS
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1 package frozen puff pastry shells (we used Pepperidge Farm, 8 per package)
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1/2 stick unsalted butter
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2 pounds Vidalia onions (about 3 or 4), trimmed and cut into thick slices 1/2 - 3/4 inch thick
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1 tablespoon minced garlic
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1 bay leaf
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1/4 teaspoon freshly grated nutmeg
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1 small bunch fresh thyme, tied with twine or wrapped in cheese cloth
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1 tablespoon fresh sage, cut into slivers
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1 teaspoon Kosher salt
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1/4 teaspoon freshly ground black pepper
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1/2 cup heavy cream
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1/2 cup vegetable stock
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1 cup grated Romano cheese
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Corn starch, as needed