Ingredients
1 tablespoon olive oil
3 onions, medium or large, sliced
pinch of salt
1 tablespoon balsamic vinegar
1 tablespoon olive oil
10 or 15 small mushrooms sliced
pinch of salt
3 cups spinach
8 oz fettuccine pasta
2/3 cup heavy cream
1/3 cup milk
1 cup grated Parmesan cheese
1/4 teaspoon salt
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http://juliasalbum.com/2013/01/creamy-mushroom-pasta-sauce-with-caramelized-onions-and-spinach-recipe/