Line a 9 x 6 x 2 baking pan with parchment paper, leaving about 1-inch overhang on all sides.
dissolve the coffee in warm water stir well and allow to cool.
In a bowl, combine whipping cream, condensed milk and liquid coffee. Using a hand mixer at low speed, whip mixture until it reaches firm peaks. then add dissolved gelatin.
Arrange one layer of graham crackers on bottom of baking dish, Spoon ⅓ of cream mixture on crackers and spread to cover.
Arrange another layer of graham over cream. Spoon and spread ⅓ of the cream mixture. Repeat with another layer of graham crackers. Spoon and spread remaining ⅓ of the cream mixture on top of crackers.
Cover tightly with plastic film and refrigerate overnight. Sprinkle chocolate shavings on top of cake or dust with cocoa powder. Cut into squares to serve.