Heat broth to boiling in 2-quart saucepan. Stir in kasha; reduce heat to medium. Cover and cook about 7 minutes or until tender; drain if needed.
Meanwhile, cook beef, celery and green onions in 10-inch nonstick skillet over medium heat 8 to 10 minutes, stirring frequently, until beef is thoroughly cooked; drain.
Stir tomatoes and pepper into beef mixture. Heat to boiling; reduce heat. Cover and simmer 5 minutes. Stir in kasha; cook until thoroughly heated.