1 1/4 pounds boneless beef chuck (in one piece)
1 cup pearl barley
1/2 pound cremini mushrooms, quartered
4 stalks celery, quartered
6 medium carrots, quartered
2 medium leeks, sliced (white and light green parts only)
1 sprig thyme
4 cups low-sodium beef broth
1 tablespoon soy sauce
Kosher salt and freshly ground pepper
Kosher salt and freshly ground pepper
Horseradish, for serving (optional)