At least 575 people have gotten sick, and at least three people have died in connection with Chi Chi’s hepatitis A outbreak, the source of which has eluded officials. Evidence is pointing to green onions as the outbreak’s source, as most of the cases were traced back to the mild salsa served in one or two of Chi Chi’s entrees, health officials are saying.

On November 15, the FDA warned consumers to only eat cooked green onions to ensure safety. It’s not yet known whether the green onions are linked to the other hepatitis A outbreaks in Tennessee and Georgia, although health officials are saying it’s a similar strain. Those outbreaks have been traced to green onions shipped from Mexican suppliers.