In the USA, we eat a lot of green beans and broccoli. Those are almost unseen here. When we do see them--in the almacen or vegetable stand--the green beans and broccoli don't look very good.
In the USA, we also have a variety of canned vegetables of assorted types and a mutiplicity of manufacturers. Here, there seems to be only canned peas. Shelf after shelf of canned peas.
In most of the restaurants, the accompaniment is usually puréed potatoes or squash. Here they tend to prefer starchy vegetables.
When you ask for a salad, you have to specify which ingredients you want in your salad: lettuce, carrots, celery, onions, eggs (they are big on the eggs here). As for salad dressing, it is oil, vinegar, lemon. You will not get the choice of thousand island, bleu cheese, or French. You can find them in the grocery store in the imported foods section. And they are fairly expensive at $7-12.
The best food deal in town is lunch where you can find the menu ejecutivo. This comes with a appetizer, drink, entre, and desert or coffee--all for about $20. Sometimes, there are a few selections; other times, it is menu del dia--you get what they made. It is consistently good, and I can almost never finish all of it. The portions here are not America-huge, but the food is more substantial.
And once I got used to the restaurant culture--if you want the waiter's attention, ask for it--I now find the restaurants and cafés to be a relaxed and unhurried experience.
But, in Argentina, if you are cooking at home and looking for a quick and easy vegetable side dish--think peas.