Step 5: Thicken the Custard
Return the mixture to the saucepan. Cook over medium heat, stirring constantly, for 3–5 minutes until thick enough to coat the back of a spoon.
Step 6: Assemble and Chill
Pour custard over the chilled crust. Press plastic wrap onto the surface to prevent a skin from forming. Refrigerate at least 4 hours (overnight is best).
Step 7: Slice and Serve
Lift the custard from the pan using the parchment overhang. Slice into squares with a sharp knife, wiping between cuts for clean edges.
