Chimichurri Sauce Recipe (great on steaks)

This South American sauce is the perfect accompaniment to a great tasting steak!

1 -1½ cups cilantro or flat leaf parsley
1Tbsp fresh oregano, or 1tsp dry
2 cloves garlic
⅓ cup olive oil
¼ tsp red pepper flakes
1 Tbsp red wine vinegar (optional)
1+ tsp fresh lime juice (optional)