INGREDIENTS
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4 slices bacon , cut into 1/2-inch pieces
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4 small onions , cut in half lengthwise and thickly sliced
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1 tablespoon plus 1 teaspoon fresh thyme leaves , chopped
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Kosher salt
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1 cup whole milk ricotta cheese
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1 egg yolk
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Freshly ground pepper
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1/4 cup plus 1 tablespoon Parmigiano-Reggiano
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1 (8-inch) frozen pie or tart shell