Gremolata and chimichurri are very similar, but they originate from two different countries. Gremolata comes from Italian cuisine while chimichurri comes from Latin America. Chimichurri has parsley and garlic, but it also has red wine vinegar and oil making it more of a sauce. The chimichurri does not traditionally have lemon zest. Both are very flavorful condiments that can be used on a variety of dishes.