A misto is a "cafe americano(which is a shot of espresso
served over hot
water)," with steamed milk on top. Not to be confused with a cafe
au lait, which is drip coffee with steamed milk on top.
Customer: "I'd like a misto to go."
Barista: "We
don't have those."
Customer: "Can you make me an Americano?"
Barista: "Yes."
Customer: "Can you put some steamed milk on top?"
Barista: "
Sure."
Customer: "Than you can make me a misto..."