In a mixing bowl, combine eggs, tomato paste, Kitchen Bouquet, salt, and black pepper. Stir in chopped green pepper, celery, and onion. Add the ground beef and croutons; mix well.
In a shallow baking pan, form meat mixture into a loaf (about 9x4 inches). Cover loosely with foil.
Bake in a 350 degree F oven for 55 to 65 minutes or until internal temperature reaches 160 degree F. Makes 6 servings.