In a cocktail shaker or jar with a tight-fitting lid, combine the instant coffee, sugar and water. Shake vigorously for 30 seconds, until very foamy.
Pour into a glass filled with ice and slowly top off with milk (or cold water).
Serve immediately!
Notes
- Greek Frappe is available in three degrees of sweetness, determined by the amount of sugar used. Glykós is sweet and 4 teaspoons of sugar are used, métrios is medium-sweet and 2 teaspoons of sugar are used and skétos is plain and no sugar is used. - You can also make an indulgent version by adding Kahlúa, Baileys or other liqueurss. Some restaurants have the option of adding a ball of vanilla ice cream instead of milk.