When making a Caffe Americano, does it matter whether you put the hot water or espresso in first? This is not a complicated drink to make, but I've seen it prepared both ways.
If it does matter, why does the order affect the taste of the coffee?
Yes. Adding water to Espresso is considered an Americano. Doing it the other way around is called a Long Black.
According to that article and below sources, the Long Black preserves the crema, whereas the Americano preparation should not. The manner in which the pour is done can contribute more to preserving or destroying the crema than the order. An Americano should have no crema and the crema should be preserved in a Long Black. It is the preservation or destruction of the crema that will affect the taste (and thus the pour) more than the order.
An Americano, which is known as a Caffe Americano or a Cafe Americano is a type of coffee created by adding hot water to espresso. It translates as American coffee because it was the way Italian baristas would approximate the taste of drip coffee for American soldiers stationed in Italy during the first and second World War.
Steps while making this Americano
Grind enough espresso beans for 1 1/2 tbsp.
Make sure your espresso machine has enough water to create steam for the coffee.
Begin heating a pot of water on a stove or in an electric kettle, if your espresso machine does not have an attachment that lets you pour hot water.
Place the espresso grounds in the port filter and evenly pack the grounds down with an attachment on the espresso machine or the bottom of a spoon.
Secure the Porte filter to the espresso machine by placing it flush with the machine and twisting to the right.
Press the on switch on the machine and allow the water to heat up if there is a separate switch to turn the machine on and start making coffee.
Place a small espresso shot cup underneath the porte filter.
Press or turn the on switch.
Pour the espresso into a coffee mug.
10.Pour in between 1 and 8 oz.
11.Turn off the espresso machine and enjoy your coffee.