Whole Wheat Fettuccini with Broccoli, Carmelized Onions and Zucchini

2 large zucchini, sliced into 1 inch half moons
1 head of broccoli, into bite sized pieces
1 sweet onion, sliced
2 tbs olive oil

Sautee the onion in olive oil until carmelized and browned, about 15 minutes.  Then add the zucchini and broccoli and sautee until bright green and tender.

Meanwhile, cook the whole wheat pasta, and reserve one cup of the pasta water  before draining, adding it to the vegetables.  Put it all together and top with grated cheese, if desired.