I got drooling while reading the "which season?" thread, and this reminded me of something I want.
In Japan, the magnolia trees produce these gigantic leaves, 8" across and a foot long, that you can use as a cooking surface. What you do is, you put something thick and wet and sticky on top of a soaked leaf, and you put the leaf on top of a grid on a charcoal grill. The food cooks, and you get this mild smoky thing going on from the leaf, but the leaf itself shouldn't burn through if you don't crank the heat too high. (The leaves are ho-ba, magnolia-leaf, so this dish is called hoba-yaki, or magnolia-leaf grilled --- same yaki as yakitori, sukiyaki, etc.)
Problem is, I've never seen these leaves here in the US. So what can I use instead? I can get frozen banana leaves, for instance, or I can pick all the maple leaves I want, and so on.