Orange Jaffa Cake (Orange Cake with Turkish Delight!)

Name: Orange Jaffa Cake (Orange Cake with Turkish Delight!)
Prep time: 12 h 20 min
Cook time: 1 h
Total time: 13 h 20 min
Cuisine: British
Ingredients: 2 cups granulated sugar (450 grams); Juice of half a lemon; Enough water so that lemon juice + water is 3/4 cup (180 milliliters); 1 3/4 cups orange juice (430 milliliters); 1/2 cup + 1 tablespoon cornstarch (70 grams); 1/2 teaspoon citric acid; 1 teaspoon orange bakery emulsion (or orange extract); Orange food coloring (optional); 2 cups all purpose flour (240 grams); 2 teaspoons baking powder; ¼ teaspoon baking soda; ½ teaspoon salt; 1 cup granulated sugar (200 grams); 1 orange, zested; 1 lemon, zested; 4 tablespoons unsalted butter, melted (60 grams); ¼ cup canola oil (60 milliliters); 2 large eggs, room temperature; 1 teaspoon vanilla extract; ½ cup whole milk, room temperature (125 milliliters); ¼ cup orange juice, room temperature (60 milliliters); 1 tablespoon lemon juice; ¼ cup sour cream, room temperature (60 grams); 10 1/2 ounces (300 grams) high-quality dark chocolate. I used Callebaut