If you are thinking that Buenos aires has a tremendous variety of exciting food options you will be disapointed. The main spices in the porteno diet is sugar and salt in huge quantities.
In my area Palermo soho there are over 300 reataurants and I would say that only 20 serve excellent food and these are my recommendations
La cabrera Cabrera 5099 . My recommendation for the best baby beef in town and great place in atmosphere and service.
Sarkis arab restaurant located on Thames 1101. Beautiful meze and huge servings at a very reasonable price. Make sure that you visit on Monday night for belly dancing.
Moche for excellent peruvian food Nicaragua 5901
Thymus outstanding place must be visited once when in Buenos aires Lerma 525