Passionfruit Lime Coriander Cake

Name: Passionfruit Lime Coriander Cake
Ingredients: Lime Coriander Cake; ⅓ cups passionfruit juice (from 3 large passionfruit); ⅓ cups granulated sugar; 1¾ cups all-purpose flour; 2 teaspoons baking powder; ¼ teaspoons baking soda; 1 cup light brown sugar; ½ teaspoons Kosher salt; Finely grated zest of 3 limes; 1 tablespoon ground coriander; 10 tablespoons unsalted butter, at room temperature; 3 large eggs; 2 egg yolks; 1½ teaspoons pure vanilla extract; ¾ cups buttermilk (shake before measuring); Passionfruit Buttercream; ¾ cups egg whites (from 5 large eggs); 2 cups granulated sugar; ¼ teaspoons Kosher salt; 2 cups unsalted butter, at room temperature; ¾ cups passionfruit pulp (from 6 large passionfruit)