Prepare crust in food processor, processing 5 minutes with rests. Pat down into a springform pan. Chill for 6 hours.
Beat together egg white, coconut sugar, cream of tartar, and peanut fiber until stiff. In a stand mixer, prepare the rest of the filling ingredients. Fold the two mixtures together and top crust. Chill for 1 hour. Bake 1 hour and 15 minutes, or until custard is set. Carefully remove from the oven, cool on a rack, and top with shavings of chocolate.