Copycat Burger King Whopper

Name: Copycat Burger King Whopper
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: American
Ingredients: 1 pound ground chuck; 1/2 teaspoon salt + extra (divided use); 1/4 teaspoon black pepper; butter; 4 sesame seed hamburger buns; 16 dill pickle slices; 1/2 white onion (sliced into rings); 12 tomato slices; 4 tablespoons ketchup; lettuce; 4 tablespoons mayonnaise