Preheat oven to 325F. Mix the graham crumbs and sugar, and them stir in the melted butter until moistened. Press into a the base and up the sides of a 9 1/2 - 10" loose bottomed tart pan. Carefully*** place in oven and bake for 10 min. Set aside to cool.
Meanwhile, in a bowl of a standup mixer whisk the egg yolks and then add the condensed milk. Whisk for 3 minutes. Add in the juice and lime zest and continue to beat for an additional 3 min. Pour the filling into the cooled crust. Place on a rimmed cookie sheet and bake for 15 min. Let cool completely and then chill for 3 hours or overnight.
Add in the juice and lime zest and continue to beat for an additional 3 minutes. Pour the filling into the cooled crust. Place on a rimmed cookie sheet and bake for 15 min. Allow to cool completely and then chill for 3 hours, or overnight.
To make the whipped topping, add the whipping cream to the bowl of your stand mixer, with the whisk attachment and beat until soft peaks. Add in the confectioner's sugar and mix unti just combined. Serve the key lime tart with whipped cream, lime zest and slices, and rasperries for a gorgeous presentation!