No Cuban meal is complete without a cafe cubano (Cuban coffee). A well-made cafe cubano has a thick layer of sweet crema (cream) floating over strong espresso. To get the crema right, whisk about 1 tablespoon of the espresso with sugar until it turns foamy, then pour the pot of espresso over it. Lourdes Castro says you can't overbeat a crema, so stir it energetically.
1/4 cup sugar