Can I brew a double-shot on the Flair?

In the past, espresso was measured by volume, where a single shot of espresso was roughly 30 milliliters and a double shot was roughly twice this volume, or 60 milliliters. However, this type of measurement is not accurate when it comes to really understanding what is going on with the coffee in your cup, as it doesn’t take into account how much coffee, or grounds, is creating that shot, or shots. 

Nowadays, the coffee industry has moved away from this definition of "double shot," and instead focuses on the brew ratio. So, a "double shot" would now refer to a 1:2 ratio (i.e. 20 grams of dry coffee: 40 ml of "wet" coffee extracted). 

Learn more about brew ratios and their importance here