Whisk eggs and egg yolks.
Set into a stainless bowl that can sit over a pot of simmering water (bain marie).
Add juice of lemons, lemon zest, salt, sweetener and 4 tablespoons butter.
Whisk on medium low heat until it reaches 170 degrees, stirring constantly.
Remove from stove, take through a fine mesh strainer.
Stir in heavy cream.
Pour into your pre-baked tart shell (recipe below). If shell is not ready yet, place a piece of plastic wrap over lemon filling.
Pour lemon filling into pre-baked crust.
Bake for 10 minutes at 350 F (180 C).
Remove and cool for two hours before refrigeration.
Once mostly cooled, add meringue. (Recipe below)
Bake for 4 minutes at 350. If using convection oven, bake at 325 F.
Refrigerate when tarts or pie is cooled.
These will keep for up to five days in the refrigerator.