Cheeseburger Sliders – Fustini's Oils & Vinegars

Ingredients

• 12 count Hawaiian Rolls
• 1 medium onion, diced
• 1 tablespoon Fustini's Delicate SELECT olive oil, + more for brushing buns
• 2 tablespoons Fustini's 18 Year Traditional balsamic
• 1 pound lean ground beef or ground turkey
• 3 tablespoons ketchup
• 2 tablespoons yellow mustard
• 2 tablespoons pickle relish
• 1/4 cup Mustard Aioli Sauce
• 4 slices sharp cheddar cheese
• 1 cup grated white cheddar cheese
• sesame seeds for garnish
• 1/2 cup mayonnaise
• 1 tablespoon Fustini's 18 Year Traditional balsamic
• 2 tablespoons Dijon mustard
• 1 tablespoon yellow mustard
• 1 tablespoon BBQ sauce