Kosher, Buenos Aires
Yes, I know it's dumb to make a tip about McDonald's considering all the delicious food in Buenos Aires, but this Mickey D's is different from the rest - it's kosher. It's in the Abasto shopping mall, and it's the only kosher McDonald's outside of Israel. Buenos Aires has a huge Jewish population (Argentina is the country with the third-highest Jewish population in the world - after Israel and the USA), and many Orthodox Jews live in the Abasto and Palermo areas. So if you're Jewish, or even if you just want to say you ate at a kosher McDonald's, look for it in the food court. There are 2 other McDonald's in the mall, so look for the one with the "kosher" sign.
One of the laws of kosher is that you can't mix meat and dairy, so don't expect to find cheeseburgers. All the burgers are cheese-less, and they don't serve ice cream either.
Favorite Dish: I didn't actually eat there. I thought of ordering something just to say I've eaten there, but then I thought "meh, what's a burger without the cheese?"