The only kind of chocolate that is worth its calories comes from either Belgium or Switzerland. There might be some exceptions that, unfortunately, don't come to mind as I write this.
In Argentina, cattle used to be free-range. Gradually, feed-lots crept in, and beef lost all flavor.
I don't know about Paraguay, but beef in Uruguay is even worse than in Argentina. Generally, food in Uruguay is deplorable, and local coffee un-drinkable. But there's a great variety of good herbal teas.