Chef John's Beef on Weck Sandwiches

By Chef John

4.9 / 5

10min

20min

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2 pounds beef top-sirloin roast
salt and pepper to taste
1 tablespoon vegetable oil
2 teaspoons all-purpose flour or as needed
2 ½ cups cold beef broth
2 teaspoons aged balsamic vinegar or to taste
4 kummelweck dinner rolls split
¼ cup extra-hot prepared horseradish or to taste