A ristretto is a concentrated espresso shot where there is less water in the coffee than an espresso. This is done by grinding the coffee finer than an espresso. By having the coffee ground finer, less water will be able to go through. The amount of time to “pull” the coffee is the same as an espresso which is about 25 seconds. This will create a more intense flavor with less bitterness. It is also known as a “short black” in some parts of the world.