This is a wonderful coffee flavored, chilled tart that is not difficult to make, and fun to serve. The sweet pastry is filled with ground hazelnuts and pre-baked before adding the filling of coffee, eggs and cream. One of the secrets in making the filling is to have all the ingredients prepared and ready before starting. As the coffee and unflavored gelatin mixture is cooling, whip the cream and egg whites, then the egg yolk and sugar mixture. Once the cooler ingredients are folded in, the mixture will start to thicken, so you’ll want to work quickly to get the finished mixture poured into the pan