Heat oil and margarine in large size skillet. Add beef and stir-fry
until lightly browned. Set aside.
In a saucepan, combine tomatoes and their liquid, tomato paste,
beef stock, water, salt. Stir and heat until boiling. Add to beef,
blend and bring to boil. ( Remember to drain beef before
combining with tomatoes, etc.) Break spaghetti in half and add
to boiling mixture. Reduce heat so liquid barely simmers. Cook
10 to 15 minutes or until spaghetti is tender, stirring frequently.