I was making some pickles the other day, because my dad is going to visit my grandfather in Florida, and he really likes my bread & butter pickles, and I ended up with some pickling juice left over. So,since I didn't want to waste good pickling juice, I looked around the kitchen and said to myself, "Self, what can I pickle?" And having rejected lettuce, the blender, and meat, I settled on an apple. Which I pickled. It's sitting in the refrigerator now, in a jar, and I have no idea if it is any good or not. I've never heard of anyone pickling an apple, but on the other hand, I've never heard anyone say that you shouldn't.
UPDATE: I tried the pickled apples today. I was having a grilled cheese sandwich and we were out of the actual pickles, and as you may know, it is physically impossible to eat a grilled cheese sandwich without sweet pickles. So I ate a couple of slices of the apple and they were... not bad. Not great, but not bad. A little mealy for my taste.
I think I'll make some more pickles tomorrow.