01 -
Place granulated sugar in a large bowl and use your hands to rub in the lemon zest.
02 -
Add the large eggs and fresh lemon juice to the bowl; whisk everything to combine, then transfer to a large heavy-bottomed pot.
03 -
Over low to medium heat, cook the filling while whisking constantly. Do not increase the heat to avoid burning. Continue whisking until the mixture reaches 180F/82C, thickening significantly. Use an instant-read thermometer to monitor the temperature.
04 -
Once the mixture reaches the correct temperature, remove it from heat and pour it through a sieve into a clean bowl. Let it cool for 10-15 minutes.
05 -
Transfer the cooled mixture to a food processor. Turn the food processor on and slowly add the butter, 5 pieces at a time, allowing a minute in between each addition. Once all the butter is incorporated, process for an additional 3-5 minutes to achieve a creamy texture.
06 -
Pour the filling into a clean container, press a piece of plastic wrap directly on the surface to prevent a skin from forming, and refrigerate for at least 4 hours or up to 2 days.
07 -
When ready to assemble, whisk the chilled cream and spread it evenly into the tart shell using an offset spatula. Place plastic wrap on top to prevent a skin from forming, and chill for 30 minutes or up to 5 hours for best results.
08 -
Top the tart with fresh berries. For a shiny finish, warm some apricot or orange jam and gently brush it onto the berries using a pastry brush.
09 -
Store the assembled tart in the fridge until ready to serve.