Potato sounds good, but definately not Moussaka!
I believe there is another name for that recipe, which escapes me now...
We love eggplant, I make eggplant rolatini's too...
Eggplant with ricotta rolled inside, and tomato sauce & mozzarella over the top...
You could also make the Moussaka with zucchini sliced lengthwise... it would be close...

I also make a lasagne, with eggplant replacing the pasta... yummm... with a homemade sausage meat sauce...