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Ingredients

• 1 1/2 pounds red-skinned potatoes, pierced with a fork
• 4 tablespoons unsalted butter
• 3/4 to 1 cup milk
• Kosher salt and freshly ground pepper
• 1/2 medium onion, sliced
• 3 tablespoons all-purpose flour
• 2 1/2 cups low-sodium chicken broth
• 2 teaspoons Worcestershire sauce
• 4 thick slices sourdough bread
• 3 tablespoons dijon mustard
• 1 tablespoon prepared horseradish
• 3/4 pound sliced roast beef
• 1/2 bunch watercress, woody stems removed
• 1/4 cup chopped fresh parsley

Description

Food Network Invites You To Try This Hot Open-Face Roast Beef Sandwiches Recipe From Food Network Magazine.

Food Network