Vegan Chocolate Cake

Name: Vegan Chocolate Cake
Ingredients: 1 cup neutral oil, such as canola, plus more for pans; 3 cups unbleached all-purpose flour; ⅔ cup unsweetened cocoa powder; 2 teaspoons baking soda; 1 teaspoon kosher salt; 2 cups granulated sugar; 4 teaspoons instant espresso powder; 4 teaspoons pure vanilla extract; ¼ cup apple-cider vinegar; ½ cup margarine; 3 cups confectioners' sugar, sifted; 1 teaspoon instant espresso powder; 2 tablespoons dairy-free soy creamer; 1 teaspoon pure vanilla extract; 2 ounces bittersweet chocolate, melted and cooled; 5 ounces bittersweet chocolate, finely chopped (1 cup); 1 tablespoon golden syrup or brown rice syrup; ⅓ cup dairy-free soy creamer