French Dip Sliders (Tender Roast Beef, Melty Cheese, Au Jus)

Ingredients

• 1 pack of buttery Hawaiian rolls.
• 1/4 cup of mayo.
• 1 tablespoon of prepared horseradish.
• 1/2 pound of sliced Swiss or provolone cheese.
• 1/2 pound of roast beef slices from the deli.
• 1/2 cup of onions cooked till golden.
• 4 tablespoons of melted butter.
• 1 teaspoon of Worcestershire.
• 1/2 teaspoon of powdered onion.
• 1/4 teaspoon of garlic powder.
• Chopped fresh parsley.
• 2 cups of beef stock.
• 2 tablespoons of butter.
• 1 clove of garlic.
• 1 1/2 tablespoons of all-purpose flour.
• 1 tablespoon of Worcestershire sauce.
• 1-2 teaspoons of beef bouillon paste.
• A few sprigs of thyme.
• Salt and pepper, as needed.