Melt butter in heavy pan. Add asparagus and saute 3 minutes. Using slotted spoon, transfer asparagus to bowl.

Add onions and garlic to pan and saute until golden @ 7 minutes. Add tomatoes with juice, oregano and red pepper and bring sauce to a boil.

Reduce heat to medium and simmer until sauce thickens, breaking up tomatoes and stirring occasionally (@ 15 mins.) Return asparagus to sauce and cook 3-4 mins until asparagus is tender.

Add cooked penne and 1/2 cup parmesan cheese and stir and serve