Ones I've occasionally done in the past ...
An electrolyte type fluid, to help replenish the minerals lost. A small container of milk, or one of the "meal replacement" milk alternatives (ie, Muscle Milk, Ensure, etc). Bags of nuts/seeds. Jerky or a smaller roll of salami (which aren't my faves, but they'll do). Those "rope" cheese sticks of mozarella (if they've got 'em in mozarella instead of the heavily-processed variants). Some of the better "energy" bars (though, "better" is clearly relative). Fresh, whole fruits if they've got them, which many of the puny "convenience" add-ons for gas stations won't have.
Which reminds me why I'm such a fan of homemade "trail" mix. Reasonable spread of nutrients, plenty of fat/protein/carbs, long-lasting and not requiring refrigeration, and tasty. Just put a pint-to-quart of it in the saddle bag, and other than fluids I'm generally good to go.