Salsa verde

Salsa verde is a type of spicy, green sauce in Mexican cuisine based on tomatillo and green chili peppers. The tomatillo-based Mexican salsa verde dates to the Aztec Empire, as documented by the Spanish physician Francisco Hernández, and is distinct from the various medieval European parsley-based green sauces. In the cuisines of Mexico and the Southwestern United States, it is often served with Mexican or Tex-Mex style dishes like enchiladas and chicharrón (pork rinds). The version typical of New Mexico consists mostly of green chile rather than tomatillos.

Source: Wikipedia