Bay leaf? Just because every legitimate recipe has a bay leaf, I guess
When you're really desperate for a mocha but don't have access, just try this: Make a regular coffee and throw some chocolate chips in! Yes, it's pretty disgusting, and the chocolate just ends up kind of lumped at the bottom. But just pretend you're riding the rails, not a care in the world (except basic survival), and some generous engineer has thrown some bits of chocolate in your face! It goes perfectly with beans and spam cooked right in their cans over a fire made from your dashed hopes and tattered soul