Carmelized Onions, Spinach, and Walnuts with Penne

A variation of one of Molly's pasta dishes from "Simple Suppers." Served with grated parmesan, this dish has become a kind of comfort food for all seasons. Pair it with a favorite wine!

Ingredients:
2 tablespoons olive oil
4 medium yellow onions, sliced in moon-shaped crecents
10 ounces chopped spinach leaves
10 ounces penne pasta
1 ounce coarsely chopped walnuts

Heat the olive oil for a few minutes in a large skillet; (I use a 12" skillet). Add the onions and sautee on medium-high heat, stirring occasionally until the onions begin to carmelize. Bring the pasta to a boil, and drain. Right before serving, add the chopped spinach and cook gently for no more than two minutes. Serve over pasta with chopped walnuts and parmesan.