Burger----------------
3 pounds ground beef 80/20
6 tablespoon butter divided
1 tablespoon ground black pepper
1 tablespoon granulated garlic powder
1 tablespoon onion powder
1 tablespoon kosher salt
Bread----------------------
1 loaf PuertoRican bread 33 inches long
Mayonnaise Mixture---------------
1/2 cup mayonnaise
1 teaspoon yellow prepared mustard
1/2 cup softened butter
Garlic Butter-------------------
3 teaspoon granulated garlic powder
Parchment paper--------------
As needed butter for the parchment paper