The Filling:
5 eggs
1 cup sugar
5 Tbls lemon juice
1 egg yolk
2/3 cups heavy cream
1 Tsp lemon extract

The Crust:
Mix sugar and butter. Add the rest of the ingredients and mix until incorporated. Roll out 1/4 inch thick and put in a 9" tart pan.

The Filling:
Pour into tart shell. Bake at 325 degrees until set. Chill before cutting.