01 -
Preheat your oven to 350°F (175°C). Line an 8x8-inch pan with aluminum foil and grease with melted butter.
02 -
Wash and blend fresh blackberries until smooth. Strain through a fine mesh sieve to remove seeds, aiming for 3/4 cup of puree.
03 -
In a bowl, combine the flour, sugar, and salt. Stir in the melted butter until no dry flour remains. Press the mixture evenly into the prepared pan and bake for 18-22 minutes, or until golden brown.
04 -
While the crust bakes, combine the blackberry puree, lemon juice, and sugar in a saucepan. Heat over medium heat until the mixture comes to a simmer. Whisk in the eggs, egg yolks, and butter. Cook while stirring constantly until the mixture thickens and reaches 190°F. Strain the curd through a sieve to ensure a smooth texture, then pour over the baked shortbread crust.
05 -
Return the pan to the oven and bake for 13-15 minutes, or until the curd is set.
06 -
In a heatproof bowl, combine egg whites and sugar. Set the bowl over a saucepan of simmering water, whisking constantly until the sugar dissolves and the mixture is warm to the touch. Remove from heat and beat the mixture with an electric mixer until stiff peaks form. Pipe or spread the meringue onto the cooled bars. Lightly torch or broil for a golden finish, if desired.
07 -
Let the bars cool to room temperature, then chill in the refrigerator for 1 hour. Slice into squares and serve.