"When I prepare eggs this way, I tell myself: he will come and eat," says Yadira Martinez, who shared her son Jaime's favorite recipe with other mothers who, like her, tirelessly search for their missing children in Mexico. Part of the profits from the sale of the "Cookbook for the Memory," a book collecting recipes of these dishes, funds the excavations of Yadira and other mothers in the city of Penjamo, Guanajuato. About 3,700 people have disappeared in this north-central state due to criminal violence. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES