From the "Seven Fires" Argentinian cookbook. This pesto-like sauce is offered in many restaurants as an alternative to chimichurri or salsa criolla. Use it on Recipe #478140 and other grilled meats.
Combine the parsley and garlic in a small bowl. Slowly add the olive oil, whisking to combine. The sauce will be bright green and thick with parsley. Season to taste. Can be kept refrigerated for up to 3 or 4 days, bring to room temperature before using.