Full Gaps - Rhubarb Bars 400 grams rhubarb (about 10 to 15 stalks) 1/3 cup sugar 6 egg yolks 3/4 cup sugar a pinch of salt 1 teaspoon lemon zest (optional) 50 grams unsalted butter, cut up into chunks 4 ounces butter, room temperature 1 cup (136 grams) all-purpose flour 1/4 cup sugar a pinch of salt about 1/2 of the Rhubarb curd recipe from above Powdered sugar for dusting (optional)