What is a good subsitute for Mirliton (aka Chayote)? My daughter wants to cook a recipe that she found in a cookbook.  The main ingredient is Mirlitons, but I don't think I'm going to be able to find them where I live.  I've never had them myself, so I have no clue what would be a good subsitute.  Any suggestions?

If it matters, the recipe is basically cut them in to strips, season them, coat them with flour and fry them.
Mirltons are a member of the squash family, but have a traslucent, soft-crisp texture which isn't really exactly like any other squash.  In recipes where they are an incidental ingredient, you can generally substitute zucchini (especially if you peel and seed it) without too much trouble, but in recipes where they are a main flavor they are hard to substitute.

And, as Mien points out, it never really works to substitute the main ingredient in a recipe.  I suggest that your daughter wait for midsummer and check out Mexican or Indian groceries until she finds some.