With a perfect crispy crust and a creamy yet thick key lime filling, this is truly the best key lime pie you will ever have.

For Allen, the ultimate key lime pie filling ingredients are a well-kept secret, one she's guarded since she began making the pies in 2010. The only ingredient the self-taught baker will divulge ...

Add condensed milk and whisk a few more minutes more. Add passion fruit purée, lime zest, juice and combine. Pour the filling into the cooled pie crust. Bake until the filling sets but still ...