[Wobble73]

In modern Judaism, meat and dairy aren't eaten together. However, fish can be served in a dairy restaurant. The reasoning, AFAIK, is because nobody is going to mistake the (appearance? taste?) of fish for red meat. Why's that matter? It all ties back to the (decidedly odd) way the rabbis understand the verse that says "Don't boil a kid (as in baby goat, not as in child) is its mother's milk.". That's where the whole separation of meat and dairy comes from (don't ask).

Well, that's not much of a restriction, actually. I also don't drink milk with meat unless there's nothing else to drink, simply because they don't go well together. There probably are dishes that combine the two, but I've yet to come across one. The idea of red meat+dairy strikes me as odd.

Have you never had a Cheeseburger???   

[Dragon]

Ah, this. McDonald's meals aren't exactly gourmet food, so I never thought of it that way. I only eat fast foods when I just need something to fill my stomach when I'm short on time. Not that McDonald's cheese has much to do with dairy anyway. I've once looked on the bottom of a frozen pizza (not McDonald's though) and saw "cheese analogue" in the ingredients list (needless to say, I've stopped buying that particular brand of pizza after that). I wouldn't be surprised of cheeseburgers used something similar. Along with a meat analogue.

[Wobble73]

Other restaurants make cheeseburgers too you know? Many with better ingredients, and real cheese. A local cafe to me makes a great Bacon Cheeseburger with real cheddar cheese! And it doesn't have to be gourmet to taste good!

[Black Wolf]

Ah, this. McDonald's meals aren't exactly gourmet food, so I never thought of it that way. I only eat fast foods when I just need something to fill my stomach when I'm short on time. Not that McDonald's cheese has much to do with dairy anyway. I've once looked on the bottom of a frozen pizza (not McDonald's though) and saw "cheese analogue" in the ingredients list (needless to say, I've stopped buying that particular brand of pizza after that). I wouldn't be surprised of cheeseburgers used something similar. Along with a meat analogue.

It's not just burgers. Any meat/cheese combo is out - no cheese on your ham and cheese sandwich (or beef and cheese I suppose). Also. any creamy casserole type dish that uses cream or milk... or any kind of sauce that uses cream (which is more common than you might think). Want mashed spuds with your steak? Nope, no milk allowed. Nice creamy goat curry? Nope. Minted yoghurt on your Moroccan lamb? Nope. Lovely bit of gamey meat like Kangaroo or Venison with a chocolate jus? Nope. Bit of feta and olives and chorizo on the table at a party? Nope.

It's a silly, silly restriction.

[Ghostavo]

No fondue? That's heresy!

[karajorma]

It's worse than that. They have declared Flying Spaghetti Monster unclean if he is seasoned with holy Parmesan.

[Flipside]

Call the Pastor of Pasta!!

[Sandwich]

Lasagna, meatballs & spaghetti (w/ parmesean), tacos.. all not rabbinically kosher.