INGREDIENTS
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1 tablespoon olive oil
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3 onions, medium or large, sliced
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pinch of salt
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1 tablespoon balsamic vinegar
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1 tablespoon olive oil
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10 or 15 small mushrooms sliced (I used shiitake with stems removed)
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pinch of salt
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3 cups spinach
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8 oz fettuccine pasta
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2/3 cup heavy cream
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1/3 cup milk
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1 cup grated Parmesan cheese
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1/4 teaspoon salt