Rustic Vidalia Onion Tart
INGREDIENTS
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adapted from Rustic Vidalia Onion Tart
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2 tbsp butter
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3 large sweet onions, halved and thinly sliced
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1/2 tsp rosemary
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1 tsp salt
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1/2 tsp pepper
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1/2 tsp sugar (optional)
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1/2 recipe pie dough, or 1 refrigerated pie crust (I used Pilsbury)
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1 egg white, lightly beaten
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1 cup shredded Gruyere cheese (can sub Swiss cheese)
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