Open-Face Roast Beef Sandwiches Recipe - Adams Fairacre Farms

Ingredients

• 1 1/2 lbs Red potatoes
• 4 tbsp Unsalted butter
• 3/4 - 1 cup Milk
• Kosher salt
• Ground pepper
• 1/2 Medium onion, sliced
• 3 tbsp All-purpose flour
• 2 1/2 cups Low-sodium chicken broth
• 2 tsp Worcestershire sauce
• 4 thick slices Sourdough bread
• 3 tbsp Dijon mustard
• 1 tbsp Prepared horseradish
• 3/4 lb Roast beef, sliced
• 1/4 lb Provolone cheese, sliced
• 1/2 bunch Watercress, woody stems removed
• 1/4 cup Fresh parsley, chopped