Brown hamburger and make sure it is broken up fine. Add onion, carrots, celery, mushrooms, bell pepper and sauté until veggies are softened slightly.
Add beef broth and spices. Simmer for approx 1 hour.
Add arrugula and cream about 2 minutes before serving. Just make sure the is cream or that you temper the half & half. Bring up to temp and serve. You don't have to add the cream, it is wonderful with or without it.