These raspberry lemon bars are a twist on my classic lemon bars with the same buttery shortbread and powdered sugar top! The only difference is the proportion of raspberry juice in the lemon custard.
Start by browning the butter. Add the butter to a small pan over medium high heat and stir continuously for about 5-7 minutes until you see brown flecks swirling around. Immediately transfer to the bowl where you will be making your dough. Let cool for 5 minutes.
Preheat your oven to 325ºF. To the cooled brown butter, add your sugar, vanilla, salt, and flour. Mix with a rubber spatula until a stiff dough forms.
Line a 9" x 13" glass baking pan with parchment paper, making sure it goes up the sides for easier removal of the bars later. Dump the dough into the lined pan, and press it into an even layer.
Bake for about 25-30 minutes until the shortbread is lightly golden. Poke a few holes in it with a fork, making sure to only go halfway through the crust (this helps the filling bind later).
Filling
While the shortbread is baking, juice the raspberries. Add them to a blender and blend for 1 minute on high speed. Then, push the raspberry mixture through a sieve and throw away all of the seed/pulp left in the sieve. Add the raspberry juice to a one-cup measuring cup, and juice enough lemons to fill the rest of measuring cup. You should end up with one cup of combined raspberry and lemon juice.
Then, combine the juice, eggs, granulated sugar, flour, and salt with a whisk until smooth. Pour gently over the partially baked shortbread, then place into the oven for another 20-25 minutes until the lemon filling is mostly set.
Let cool to room temperature, then chill in the fridge for at least an hour. Then, use the parchment paper to life the whole situation out of the pan, dust with powdered sugar, slice into 12 (or more) pieces, and enjoy!