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.