For blondie: Preheat oven to 350°F. Line baking pan with parchment paper, leaving a 1" overhang on long sides of pan. Whisk flour, baking powder, and salt in a medium bowl; set aside.
For orange curd: Place lemon juice in small bowl or custard cup.
Make cake layers: Put oven rack in middle position and preheat oven to 350°F.
Lemon Curd Make the curd in two separate batches.
Whisk together flour and salt in a bowl.
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I came across these guys on Vimeo quite a while ago, first I watched their “The Black Keys” process video, and I was stunned. But for what ever reason I did not continue to watch any more. Think I needed a pee, but never-the-less I came across them again today.