Dehydration class. Photo courtesy Kelly McDonald Cornell Cooperative Extension in Cattaraugus County will offer a three-day Master Food Preservation workshop on Tuesday through Thursday, October 7-9. It will take place at the Seneca Allegany Community Center, 3677 Administration Dr., Salamanca, NY 14799. This training is for those who would like to go beyond the basics of home food preservation in their home. Topics include the science of food preservation, hands-on experience with boiling water canning, pressure canning, atmospheric steam canning, observation and…