Slow-Cooker Beef and Barley

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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)