Ailsa Craig Onion Have Been Going Strong Since 1887! This Heritage Exhibition Variety Was Named After A Small Island Off The Coast Of Scotl&.ailsa Craig Is A Large, Globe-shaped Onion With Golden, Straw Coloured Skin & Produces Weighty Onions Perfect For The Show Bench.the Excellent Keeping Qualities & Mild Flavour Make It A superb Variety For The Home Gardener Too.