I was hungry for fench toast the other night but was out of milk. I had some apple cider, so substituted that and added some cinnamon to the batter. You should have smelled it! It really turned out good. If I planned ahead to make it this way, I think I would reduce the cider some to concentrate the apple taste more, but it was good the way it was, and really different. I also sometimes use egg nog. That came about when I had a french toast craving and no eggs but had egg nog in the 'frig.