Heat oil in a medium saucepan and sauté the onions for 1 to 2 minutes. Add all remaining ingredients except the pasta. Cover, reduce the flame to low and simmer for 30 minutes. When the sauce is almost done, cook pasta according to package directions. Drain pasta. Place the pasta on serving plates and ladle sauce over.
Per serving - 375 calories, 9 g fat (21% calories from fat), 14 g protein, 59 g carbohydrate, 16 g fiber, 0 mg cholesterol, 466 mg sodium