"Manwhich" Style Sloppy Joe's

"MANWICH STYLE" SLOPPY JOES   

3 lbs. ground beef
1 c. ketchup
1/3 c. vinegar
1/2 c. sugar
3 tbsp. Worcestershire sauce
2 sm. cans tomato paste
1/4 c. onion, chopped
1/4 c. chopped celery
1/4 c. chopped green pepper