If you haven't had "s'mores" you are really missing out. You take a large roasted marshmallow and a piece of chocolate and sandwich them between 2 graham crackers. The hot marshmallow melts the chocolate a little and it tastes amazing.
"The original graham cracker was made with graham flour, a combination of finely-ground unbleached-wheat flour with the wheat bran and germ coarsely-ground and added back in providing nutrition and flavor. While graham crackers started out as a mild food, unsweetened or mildly sweetened, they are more commonly known as a sugar and/or honey sweetened baked good that approaches a cookie (or the British English term biscuit)."
If you're familiar with the "Digestive biscuits" that they have in england, they taste similar to those with a similar texture.