Valentine Chocolate Souffle with Mocha Sauce

Name: Valentine Chocolate Souffle with Mocha Sauce
Ingredients: Souffle:; 2 tablespoons unsalted butter, melted; 3 teaspoons unsweetened cocoa powder, divided; 2 tablespoons all-purpose flour; 1/4 cup superfine sugar; 1/4 teaspoon fine salt; 1/4 teaspoon cornstarch; 1 large egg; 1 egg yolk; 3 tablespoons heavy cream; 2 tablespoons whole milk; 2 (1 ounce) squares bittersweet chocolate, chopped; 2 (1 ounce) squares semisweet chocolate, chopped; 3 egg whites; 1 teaspoon superfine sugar; Mocha Sauce:; 1/2 cup heavy cream; 1 tablespoon instant espresso powder; 2 tablespoons light corn syrup; 1 tablespoon coffee liqueur (such as Kahlua®); 1/4 teaspoon vanilla extract; Garnishes:; 2 small scoops vanilla ice cream; 8 fresh raspberries; 2 tablespoons chocolate shavings, or to taste