Classic Beef on Weck

Ingredients

• 2 to 3 pounds beef roast (e.g., top round or brisket)
• 2 tablespoons olive oil
• Salt and pepper to taste
• 1 onion, chopped
• 2 cloves garlic, minced
• 1 cup beef broth
• 1 tablespoon Worcestershire sauce
• 3 cups all-purpose flour
• 1 cup warm water
• 2 tablespoons sugar
• 1 packet active dry yeast
• 1 teaspoon salt
• 1 tablespoon caraway seeds
• Coarse sea salt for topping
• ½ cup mayonnaise
• 2 tablespoons prepared horseradish
• 1 teaspoon Dijon mustard