This one should be obvious just by looking at the word, but so many people make the same mistake when they're ordering their daily coffee, and we don't want you to feel stupid if you find out you're one of them when we explain what the mistake is. Some of us here have made the same error, we promise.
This morning life-saver, a super strong shot of black coffee which the Italians make by grinding coffee beans and then steaming them, is actually pronounced exactly as it's spelled. There's no trick to it, and it's not trying to hide anything from you, just say it as you see it. So that means it's not "ex-presso". That 'x' that so many people think they see just isn't there. It's "ess-presso". Always has been, always will be.