Espresso Isn’t Technically Coffee
We usually think of espresso simply as concentrated coffee, but it’s more complex than that. To officially be “espresso,” the drink must be made in a particular way—produced by pressurizing near-boiling water through finely ground coffee beans packed into cakes.
If the drink is made any other way (in a stove-top pot or fancy pour-over method), it’s coffee. Even if it were to taste exactly like a shot of espresso, you can’t call it that unless it’s made through the pressurized method. In other words, espresso isn’t coffee.