What makes the perfect grilled cheese?

plated grilled cheese sandwich cut into triangles

Grilled cheese has been a popular lunch choice for generations, and variations on this simple sandwich can be found depending on where you are in the world. While American or cheddar cheese are the popular choice for this treat in the United States, some parts of Europe prefer Swiss or Gouda cheese to fill their bread slices. There are also a number of additions that can go into making a grilled cheese sandwich, like ham, bacon, tuna salad, tomato, scrambled eggs, herbs and spices, or sauces like ketchup or mustard. Many Canadians enjoy dipping their sandwiches in ketchup or applesauce, while people in the United States tend to prefer their sandwiches with tomato soup.