This article is from the Coffee and Caffeine FAQ, by Alex Lopez-Ortiz with numerous contributions by others.
Frappe coffee is widely consumed in parts of Europe and LatinAmerica
especially in summer. Originally was made with cold espresso. Nowadays
is prepared in most places by shaking into a shaker 1-2 teaspoons of
instant coffee with sugar, water and ice-cubes and it is served in a
long glass with ice, milk to taste and a straw. The important thing is
the thick froth on top of the glass.
 
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