Passion Fruit Bars

Name: Passion Fruit Bars
Ingredients: 1 cup (125 g) all-purpose flour; ½ cup (100 g) granulated sugar; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt; ¼ tsp. baking powder; ½ cup (1 stick) unsalted butter, melted, slightly cooled; 1 tsp. vanilla extract; ¼ cup (31 g) all-purpose flour; ¾ tsp. cream of tartar; 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt; 4 large eggs; 2 large egg yolks; 1¼ cups passion fruit juice (preferably Ceres or Goya Passion Fruit Cocktail); 2 Tbsp. fresh lemon juice; 1 cup (200 g) granulated sugar; 2 Tbsp. unsalted butter; Fresh passion fruit or powdered sugar (for serving; optional)