Why "expresso" isn't a legit brew

What kind of error is it?

Spelling and pronunciation error

Why do people make this mistake?

The error likely arises from the influence of the English word "express", leading people to mistakenly believe "expresso" is correct. Additionally, "expresso" might seem logical due to the coffee's association with express or quick preparation.

What is correct?

The correct term is "espresso", which is an Italian coffee brewing method that extracts flavors by forcing a small amount of nearly boiling water through finely-ground coffee beans.