Chimichurri is one of most delicious and versatile sauces around. It's traditionally served with grilled steak, and is an essential part of the Argentinian parilla, but it goes great with chicken and fish too. Chimichurri works well as a marinade, and is also delicious on vegetables. You will quickly develop your own proportions in this recipe. Some people prefer more garlic, some prefer only parsley, some add fresh tomatoes - experiment to come up with your own signature chimichurri.