In general, Sicily has a very tight economic and cultural bound with oranges and lemons. Citrus fruit are extremely difficult to grow where winter gets cold (that's why the richest in Europe had enormous rooms in which you moved whole trees during winter, called orangeries [0]) and Sicily was the lead world producer of oranges in a time when it was impossible to grow them systematically anywhere else. If you're Italian, the correlation Sicily - oranges is almost automatic.
0: https://en.wikipedia.org/wiki/Orangery