Very Key Lime Pie

Directions

1. 1
   In a medium bowl, stir together the condensed milk, lime zest and juice, egg yolks, salt and optional citric acid.
2. 2
   When these ingredients are thoroughly combined and smooth, pour them into the baked crust.
3. 3
   Chill the pie for 4 hours.
4. 4
   Whip the heavy cream until it forms soft peaks.
5. 5
   Gradually add the sugar and continue whipping until the cream forms stiff peaks.
6. 6
   Spread the whipped cream decoratively over the pide filling, sprinkle the optional lime rind over the cream and serve the pie as soon as possible.
7. 7
   It doesn't cut very neatly, but no one will care.