shack burgers 1/3 cup mayonnaise2 teaspoons ketchup1 teaspoon yellow mustard2 dill pickle chips (, plus 1 teaspoon brine)pinch of sugarpinch of cayenne pepper1 lb ground beef (, (80% lean))2 tablespoons unsalted butter4 potato hamburger buns1 tablespoon vegetable … [Read more...] about shack burgers