line an 8x8 inch pan with parchment leaving overhang and lightly grease
mix graham crumbs sugar salt and melted butter until evenly moistened
press firmly into an even layer
bake until lightly golden and set.
Make Filling and Bake
whisk condensed milk and egg yolks until smooth and slightly thickened
whisk in lemon juice zest and salt until combined and glossy
pour over warm crust and smooth the top
bake until edges are set and center barely jiggles.
Chill and Serve
cool completely at room temperature
cover and refrigerate until fully chilled and firm
lift out using parchment and slice into bars with a clean knife
dust with powdered sugar or top with whipped cream and zest before serving.
Notes
1. Chill 4 to 6 hours or overnight for clean slices. Use fresh lemon juice for best flavor and set. For easier release and neat edges use parchment and wipe knife between cuts. Substitute digestive biscuits or vanilla wafers for the crust