Andean Yellow Chile and Epazote Salsa (Salsa de Ají Escabeche y Paico)

Dora Asmat, a cook who keeps the archaeologists at Huaca de la Luna well fed, makes this spicy sauce at her small restaurant Don Merce, in the town of Moche. Asmat cooks outdoors, and the main feature of her kitchen is the batan (stone mortar) that she inherited from her grandmother. Growing beside it is epazote, an herb most often associated with Mexican cooking; in Peru, it is called paico.