1/3 cup mayonnaise
2 teaspoons ketchup
1 teaspoon yellow mustard
2 dill pickle chips, plus 1 teaspoon brine
Pinch of sugar
Pinch of cayenne pepper
1 pound ground beef chuck (80% lean)
2 tablespoons unsalted butter
4 potato hamburger buns
1 tablespoon vegetable oil
Kosher salt and freshly ground black pepper
4 slices American cheese
8 thin slices plum tomatoes
4 lettuce leaves