This is an Italian main course that places emphasis on the earthy goodness of fresh mushrooms.   Sean Gallup, Getty Images Mushroom, spinach and Cheese Torta 1/4 Cup olive oil 2 cups chopped onions 4 garlic cloves, minced 6 cups sliced fresh mushrooms 10 ounces fresh spinach 1 1/2 cups ricotta cheese 1 1/2 cups […]