An outbreak of Salmonella Enteritidis infections was associated with the Acapulco Restaurant in Newton, Kansas. The epidemiologic and clinical data suggested a continual source outbreak. Statistical analysis revealed that eating pico de gallo, or guacamole, was significantly associated with illness. Analyzing the common ingredients of pico de gallo and guacamole, only the consumption of tomatoes was significantly associated with illness. It was not known when the tomatoes could have become contaminated. Critical food handling problems detected on inspection.