I'm ashamed to say I had never made it before, seeing as it is so darn easy I will be making it again in the near future.

Here is the recipe I made:
1. 1/4 cup coarsely chopped parsley
2. 3 tablespoons red wine vinegar
3. 4 large garlic cloves, minced (2 1/2 tablespoons)
4. 2 tablespoons oregano leaves
5. Kosher salt and freshly ground pepper
6. 1/2 cup extra-virgin olive oil

In a food processor, combine the parsley, vinegar, garlic, oregano and crushed red pepper. Process until smooth; season with salt and pepper. Transfer the sauce to a bowl and pour the olive oil over the mixture. Let stand for at least 20 minutes.

I did not process until smooth but only let the processor do a coarse chop.

I then grilled some fantastic skirt steaks on the grill & served with the chimichurri. The above recipe called for some red pepper flakes but I left those out by mistake, I know I or the other diners didn't miss them.