This is the quintessential French tart. This recipe calls for a pre-baked tart shells and as far as I'm concerned every pantry should have them. They make this sort of project a lot more managable.
Serve you tart with a little ice cream or whipped cream and it makes an extraordinary dessert!
Preheat oven to 350 degrees.
Combine the eggs, yolks, sugar, juice and zest over a bain marie.
Add butter and cook, whisking occasionally until thick.
Strain into tart shell.
Bake until set, about 10-12 minutes.