French Dipped Sandwiches

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1 small onion, roughly chopped

1 small carrot, roughly chopped

1 stalk celery, roughly chopped

1 small leek, white and light-green parts only, roughly chopped

2 cloves garlic, chopped

1 sprig fresh thyme

1/4 teaspoon dried sage

1/4 teaspoon dried oregano

1/4 teaspoon ground nutmeg

1/2 teaspoon ground cloves

1/2 teaspoon ground allspice

2 pounds beef top round roast

Salt and freshly ground pepper

2 cups beef broth

6 French rolls

Hot mustard, for serving