Upstate-Style Roast Beef Sandwich

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One 4-pound eye of round roast or round roast

Kosher salt and freshly cracked black pepper 

3 tablespoons Dijon mustard 

2 teaspoons dried oregano 

2 teaspoons dried parsley 

2 teaspoons dried sage 

2 teaspoons dried thyme 

4 small sprigs fresh rosemary 

2 cups beef broth 

2 tablespoons soy sauce

2 tablespoons Worcestershire sauce

1/2 cup sour cream 

1/4 cup mayonnaise 

3 tablespoons prepared horseradish 

2 teaspoons apple cider vinegar 

6 soft or kaiser rolls 

1/4 cup (4 tablespoons) unsalted butter, melted 

1 teaspoon caraway seeds 

2 teaspoons pretzel salt (or kosher salt) 

Finely shaved onion, for serving (optional)