The GREATEST GRILLED CHEESE SAMMICH!
Milton’s bread
http://www.miltonsbaking.com/product-detail/multi-grain
Swiss cheese
AND
a think layer of salami.
Indescribably delicious.
Thick-cut white bread, real butter slathered on both sides of each slice. Thick slice of sharp cheddar.
-or-
Seedless rye, real butter slathered on both sides. Muenster cheese, coarse black pepper, small rub of horseradish.
Buttered sourdough and swiss cheese.
If you don’t have Swiss, I’ll take cheddar or American, as long a you put a couple of sliced dill pickles on it.
sourdough, swiss cheese, and some bacon will do nicely, thank you. Maybe tomato as well.
Muenster on rye, or just the standard, Kraft singles on well-buttered Wonder bread.
Um, what? That’s like calling a quarter pounder with cheese a “grilled cheese.”
Rye bread with seeds, buttered
Extra-sharp cheddar
Thin slice of tomato
Very thin slice of vidalia onion
Fresh tomatoes on grilled cheese can be great, but it’s tricky to get them right. If you put the tomato in at the beginning, it gets cooked, and isn’t nearly as good. Finish the sandwich and open it up to put the tomato in, though, and it just slides right out of the sandwich. There’s a very narrow window where you can put the tomato in and it stays raw, but the cheese melts around it enough to seal it in.
And if you’re having tomato soup with the sandwich, you can do far, far better than Campbell’s. It doesn’t hold a candle to my grandmother’s soup recipe.
Jewish Rye, real butter on the outside, any cheese except American, bacon and a fresh slice of tomato(in the Summer). Real Mayo.
Jewish rye and bacon? What is wrong with you people?
ETA: I’m not even Jewish, but frickin’ bacon has no place in a grilled cheese. It’s a grilled goddamned cheese. Putting bacon on it makes it a grilled bacon sandwich of some sort, that happens to have cheese on it.
Thick white bread, tasty cheese, baked beans, lashings of butter.
Now I’m hungry.
When are we eating? 
Oh, yeah, I like a kosher dill spear on the side.
I’m with you, pulykamell. My husband and I have this argument all the time. He constantly wants to make a grilled cheese the special of the day at the deli. Except in his view, the sandwich always has ham or turkey or beef. That’s not a grilled cheese!
That’s a meat sandwich with cheese.
I think sourdough and a good cheddar is probably my favorite, but a good rye with swiss ain’t bad either.
Yep. That’s a grilled ham & cheese (or croque monsieur, if you want to be French) or grilled turkey & cheese, roast beef & cheese, etc. I’m nowhere near being a vegetarian, but I’d be pissed if a “grilled cheese” came with any animal product on it.
With vegemite.
Grilled cheese and vegemite sandwiches: food of the gods.
Sourdough, sharp cheddar, butter. But in a pinch, white bread and American cheese will suffice.
And I stand with those who say adding a slice of ham makes it a grilled ham and cheese, NOT a grilled cheese.
Use sweet white bread, wrap in aluminum foil, iron it well.
Unseeded rye or sourdough, fried and pressed flat in too much butter, with cheddar cheese. Tomato soup optional and appreciated.
Joe
Sharp cheddar, not extra sharp, that’s too far, but anything milder than sharp cheddar is not good enough. Worcestershire sauce inside, that stuff is great hot. Good bread. Yeah, its a bastard Welsh Rarebit, but it does come together right.
I enjoy fancy-in’ up my food as much as the next guy, but grilled cheese isn’t supposed to be fancy, damnit! I’m very particular about my grilled cheese, in that not a single on of the ingredients are something I would eat on their own. Cheap white bread, preferably a few days old. Butter or margarine on the outside. Shiny, imitation “cheese” product (Kraft Singles or Velveeta. Store brand imitations are acceptable). And it must be well done. When it’s so black on the outside that you’re afraid the dog won’t eat it, give it a few more seconds. Then slide it over to me with a small dish of tomato soup (with milk) for dipping. Then I’m a happy, happy little girl inside 
Also: I agree with TriPolar. Cutting on the diagonal is necessary.