Make the cheeseburger topping. Add the ground beef, caramelized onions (or relish), chopped pickles, 1 cup of chopped cheese, 1 tablespoon of mustard, crushed garlic, 1 tablespoon of pickle juice, ½ teaspoon of salt, 1 teaspoon of fish sauce and a good grind of black pepper to a mixing bowl. Use a large spoon of spatula to mix into a cohesive topping, making sure the seasoning is evenly dispersed throughout the beef.