Heat oven to 350ºF
Line a 9x9 baking pan with parchment paper
Make the crust, combine lemon zest and sugar and mix, use your fingers to rub the zest into the sugar. Add butter and salt and mix until creamy.
Add flour and mix until fine crumbs of dough form, then transfer to the baking pan. Use your hands to press down an even layer.
Bake 15-22 minutes until crust is a golden brown.
Whisk eggs in a medium bowl. Add lemon zest, lemon juice, sugar and salt, and whisk until smooth. Then add flour and mix until combined.
When the crust is baked, immediately pour filling while it's still hot. Then continue baking for 18-20 minutes.
Place pan on wire cooling rack and let cool. Refrigerate for 3 hours or overnight.
Sift powdered sugar on top, remove from the baking pan, cut, and serve
