Chimichurri or chimmichurri is an uncooked sauce used both in cooking and as a table condiment for grilled meat. It originated in Argentina, and comes in a green (chimichurri verde) and a red (chimichurri rojo) version. It is made of finely chopped parsley, minced garlic, olive oil, oregano and red wine vinegar. The dominant flavors are parsley and garlic.

It is widely used in Argentina and Uruguay. In Costa Rica the term chimichurri is popularly used to refer to the pico de gallo. In León, Mexico, the name “chimichurri” is applied to the pizza topping originating in this city. Its ingredients are mayonnaise, mustard, chile de árbol, white vinegar, garlic, oil and salt. This dressing has an orange hue and is very popular in the city.

More Info: en.wikipedia.org