Reduce the oven to 350F.
Whisk together eggs and yolks. Set aside.
Zest two lemons. Squeeze lemon juice.
Add the zest, juice, butter and sugar to a medium sized pot. Place over medium heat.Constantly stir until butter is melted and mixture starts boiling. Remove from the heat.
Very slowly in a few steps add into egg mixture while whisking constantly. (if added at once, eggs can cook and it would smell like scrambled eggs)
Pour mixture back into the pot and place over a low heat. Whisk constantly until mixture thickens and starts to bubble.
Strain the curd into a bowl.
Pour the curd into the tart shell. Smooth the surface.
Bake for about 9-10 minutes.
Let it cool and refrigerate for at least 1 hour before serving.