Chimichurri is a green herb sauce primarily made of fresh parsley, cilantro, garlic, onion, red chili, salt, pepper, and olive oil. It does not contain any nuts. Chimichurri has a rustic texture as herbs are either pounded in a mortar pestle or chopped. Pesto is also a green sauce but primarily made of nuts, fresh basil, garlic, and olive oil along with cheese.