We stayed at this hotel (with some rooms) facing the water in Ortigia (just across the bridge from Siracusa) last spring.
http://www.apprododellesirene.com/home.html
The hotel is part of a large family home that has been subdivided. The proprietress, who lives on the opposite side of the big building, offers small format cooking courses in her home. You begin your day by walking across the corridor from your hotel room to her private home. The website describes it as "not a school but a simple demonstration of Sicilian dishes in a [sic] informal setting."
A gal we met took the 1-day cooking class (she happened to be the only participant that day) and really enjoyed it, starting with their visit to the outdoor fresh market in Ortigia:
http://www.apprododellesirene.com/cooking.html (scroll to bottom of page for English)