Beef on Weck

Part 1:

Part 2:

Ingredients for 12 Kummelweck Rolls:
1 envelope active dry yeast (2 1/4 tsp)
1 cup warm water (105 F.)
2 tbsp vegetable oil
1 tbsp sugar
1 1/2 tsp salt
1 large egg white
1 generous tsp honey
1 tablespoon vegetable oil
2 pound top-sirloin roast
salt and pepper to taste
2 or 3 teaspoons flour
2 1/2 cups good quality beef broth
2 tsp aged balsamic vinegar, or to taste
4 kummelweck rolls
extra hot prepared horseradish, as needed
serve with chips or fries, and pickles
*3 1/4 cups all-purpose flour total (use 1/2 cup with yeast and water to start recipe)