Who doesn't love a Grilled Cheese Sandwich?  It was a stable in our household when we were growing up.
In the winter a bowl of tomato soup was often served with the sandwich; comfort food.

In the US the modern grilled cheese sandwich originated back in the 1920's; inexpensive sliced bread and American cheese were commonly used.
During World War II Navy cooks were broiling "American cheese filling sandwiches".  Today you can find many versions of a grilled Cheese sandwich.  With many different kinds of cheeses, spices, vegetables and meats to doctor up this once known simple sandwich.

 

To find some new grilled cheese recipes.
http://www.foodnetwork.com/recipes/articles/50-grilled-cheese.html
http://www.nationaldaycalendar.com/days-2/national-grilled-cheese-sandwich-day-april-12/