Poutine Burger - Martin's Famous Potato Rolls and Bread

Ingredients

• 4 Martin’s Sandwich Rolls, toasted
• 3 Tablespoons Butter, divided
• 1/2 Yellow Onion, diced
• 1 Pound Ground Beef
• 1 Large Egg
• 4 Tablespoons Breadcrumbs
• 1 Tablespoon Worcestershire Sauce
• 1 Teaspoon Fresh Thyme Leaves
• Salt
• Pepper
• 3 Tablespoons Butter
• 2 Tablespoons Flour, divided
• 1 Large Shallot, finely chopped
• 1 Clove Garlic, minced
• 2 Teaspoons Fresh Thyme Leaves
• 1 Cup Beef Stock
• French Fries, prepared
• 1 Cup Cheese Curds or Fresh Mozzarella