I hear that chimichurri is an Argentinian thing, which makes be want to belt out "Don't Cry For Me, Argentina" at the top of my lungs. But because I love you, I won't.
It's good on just about everything. Or even just by itself.
I got this particular recipe at RecipeZaar.
click the link for recipe
Basically you throw a bunch of yummy things into a food processor...
...and pulverize them into oblivion.
We had ours on thinly sliced sirloin that I marinated in the chimichurri for several hours, and then grilled. I even put a little on my corn on the cob...yum!