Cheeseburger Sliders for Parties - Yummy Gusto

Ingredients

• 1 pound ground beef
• 1 tablespoon butter, softened
• 1 tablespoon olive oil
• 1/2 white onion, chopped small
• 2 cloves garlic, finely chopped
• 1 tablespoon yellow mustard
• 1 teaspoon Worcestershire sauce
• 1/2 teaspoon kosher salt
• Black pepper, ground fresh to taste
• 1 pack (12 count) King's Hawaiian Savory Butter Rolls
• 16 slices American cheese (Boar's Head works great)
• 3 tablespoons butter, melted
• Pinch of salt and garlic powder
• 2 teaspoons white sesame seeds
• 1/2 cup mayonnaise
• 1/4 cup ketchup
• 2 tablespoons sweet pickle relish
• 2 teaspoons sugar
• 1 teaspoon distilled white vinegar
• Salt and pepper as needed