Flat White: Means Many Things to Many People

What’s your interpretation of a Flat White? What do you think the espresso/foamed milk ratio should be?

I understand it to be a short/strong (extra espresso) latte with a little microfoam and lots of surface tension. 50/50 ratio? Somewhere between a macchiatto & a latte?

A flat white is a more concentrated drink that will have a stronger taste of coffee than milk.
The ratio should be 1/3 of espresso, 2/3 milk