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 ...

So, What's the Best Key Lime Pie on the Internet ... until the mixture is thick (it looks similar to pound cake batter at this point). You'll then mix in one can of sweetened condensed milk ...

Add just a little bit of the spice to your next sweet and tart key lime pie, and you'll taste the difference. Read more: 30 Types Of Cake, Explained A little cinnamon always goes a long way -- and ...