Preheat oven to 325 and line a 9x13 pan with parchment paper.
Add butter, ½ cup of the sugar, vanilla extract, and salt to mixing bowl and combine. Remove 6 TB of flour and set aside. Add the rest of the flour to your mixing bowl and mix again.
Press the dough into your prepared pan. No need for it to be “pretty” (the dough will be thick and hard to spread out), but try to get it spread out evenly.
Bake until the edges are brown, about 20 minutes.
While the crust is baking, mix your filling ingredients: Mix the remaining 2 cups of sugar and 6 TB of flour. Whisk in eggs and lemon juice.
After removing crust from the oven, pour the lemon filling over the crust and place your pan back in the oven for another 20 minutes, or until the center is set.
Let cool to room temperature before serving (I know, it’s hard. I like most desserts nice and warm, but this one has to sit and cool). I like to dust with confectioners sugar before serving.