Place a fine mesh strainer over a 4 cup measure and set aside.
In a medium sized saucepan, heat the lemon juice, sugar, butter, eggs and egg yolks.
Stir until the butter is melted, then whisk continuously until the mixture thickens and holds it's shape when you lift some of it up with the whisk and it visibly mounds up when dropped back down over the rest of the curd. It should only take a few minutes.
Pour the curd through the strainer into the measuring cup, scraping with a rubber spatula to press it through. Stir lemon zest into strained curd in measuring cup.
Pour strained curd into warm tart crust and bake just until curd is set, about 5-10 minutes.
Remove from oven and rest on wire rack until cool - 1-2hrs - before slicing and serving.½