Marinated Carrot Salad

1 lb baby-cut carrots, cut crosswise in half

1 medium onion, chopped (1/2 cup)

1 medium red bell pepper, cut into bite-size pieces

1 medium stalk celery, cut into 1/2-inch slices (1/2 cup)

1 can (10 3/4 oz) condensed tomato soup

1/3 cup honey

1/3 cup cider vinegar

1 tablespoon canola or soybean oil

1 teaspoon Dijon mustard

1/2 teaspoon salt

1/4 teaspoon pepper