Sirloin Sliders – Fustini's Oils & Vinegars

Ingredients

• 3 cups sliced onions
• 5 tablespoons Fustini's Robust SELECT olive oil, divided
• 1 tablespoon Fustini's 18 Year Traditional balsamic
• 1 tablespoon Worcestershire sauce
• Kosher salt & freshly ground black pepper
• 1 1/2 lbs sirloin steak
• 1/2 cup mayonnaise
• 2 tablespoons Harwood Gold Horseradish Mustard
• 3-4 drops of Fustini's White Truffle olive oil
• 2 cups arugula
• 18 Slider rolls (Sourdough, Pretzel etc)
• Fustini's Pyramid Flake salt
• 9 slices Guéyere or Swiss cheese