Home made rice cakes are a welcome change from commercially available energy bars, but unfortunately they tend to be a quite soft. I guess I'm using a bit too much water when I cook them. I must try making some this weekend. If they come out too soft, I think I'll skip rice cakes for this ride, especially as the weather will probably still be quite warm. That only makes soft rice cakes softer.
Then there are fig bars, mini pretzels, and of course I'll take along GU Gels. Or maybe mini PBJ sandwiches. It might be wise to steer clear of neufchâtel sandwiches, unless I eat them within the first hour; again, because I expect warm weather.
As important as what to eat, is how much to eat. I found a calculator for determining nutrition for a century ride. According to the results I got, for the upcoming ride I'll need roughly the calorie equivalent of a Clif Bar per hour.
That could spell trouble. On my weekend long rides I've been eating about half that. Next time, check as soon as I register for a long ride to see how much climbing I can expect and start training my gut for the amount of food I'll expect to need on the big ride. I've read time and again that training on 200 calories per hour can't prepare a rider for the much greater amount of fuel needed during a hard race. I'm sure that's true of a century with hills, when you're training on flat ground.