If you can't get hold of Cashel blue cheese, use Roquefort, gorgonzola or even dolcelatte. You can make this with slices of apple if you prefer, or make a much heartier salad altogether by using ...
The Roquefort adds a bit of tang, so if you're making this for someone who really dislikes blue cheese, maybe only do half so you're still getting the depth it adds. But, personally, I'm not a ...