Review: Squeeze into the very popular flour + water for unforgettable food and decor

It’s another slow-fade of a day in San Francisco. At the corner of Harrison and 20th streets, an off-white cityscape that seems miles from the nearby crayoned-canyon of Mission Street, dusk starts to drop hints — on the dusty day laborers heading home, on the pram-pushing gentry and on the gathering crowd of early birds outside flour + water.