Soufflé au Chocolat

Name: Soufflé au Chocolat (Chocolate Soufflé)
Prep time: 45 min
Total time: 45 min
Yield: Serves 4
Cuisine: French
Ingredients: 40 grams (2 tablespoons plus 2 teaspoons) unsalted butter; 100 grams (3½ ounces) bittersweet chocolate, chopped; 120 milliliters (½ cup) milk; 30 grams (1 ounce) all-purpose flour; 35 grams (1¼ ounces) sugar; 10 milliliters (2 teaspoons) dark rum; 2 large egg yolks; 3 to 4 large egg whites; Few drops pure vanilla extract