Spaghetti con Cipolle

Directions

1. 1
   Bring a large pot of water to a boil and add salt.
2. 2
   Combine the onions and all but a tablespoon of the oil in a skillet with a lid.
3. 3
   Add 1/2 cup water and turn the heat to medium-high.
4. 4
   Cover and let cook for about 15 minutes, stirring two or three times.
5. 5
   The onions should be browning but not becoming crisp.
6. 6
   Uncover and cook for another 5 minutes, stirring occasionally.
7. 7
   Stir in the tomato sauce, along with some salt, pepper, and red pepper and keep warm.
8. 8
   Meanwhile, cook the pasta until it is tender but not mushy.
9. 9
   Dress the pasta with the sauce, stir in the remaining oil, and serve with the Parmesan.