On my Coffee Sunday I went into the Chelsea Market, before crossing the street and sitting a few hours in the Blue Bottle Coffee. It was a fine decision that payed with the discovery of a few other coffee things, including an Coffee (Espresso) Salt, offered at the Filling Station.
One possible use is on an avocado half.
An Avocado half, sprinkled with Espresso Salt
Fine grains of Sea Salt have been combined with Espresso
Salt Espresso at the Filling Station, Chelsea Market, New York City