Blood Orange Curd Brownies

Name: Blood Orange Curd Brownies
Ingredients: 1 cup freshly squeezed blood orange juice; 1/4 teaspoon citric acid (or 2 tablespoons lemon juice); 2 large eggs (at room temperature); 4 large egg yolks (at room temperature); 1 teaspoon blood orange zest (very finely grated/chopped); 1/2 cup granulated sugar; pinch fine sea salt; 1/2 cup (1 stick) unsalted butter; 3/4 cup granulated sugar; 1 tablespoon vegetable oil; 1 large egg (at room temperature); 1 large egg yolk (at room temperature); 1 teaspoon vanilla extract; 1/2 cup Dutch process cocoa powder (sifted); 1/3 cup all-purpose flour; 1/4 teaspoon fine sea salt