Buttermilk Panna Cotta with Berries and Vanilla Sabayon

Name: Buttermilk Panna Cotta with Berries and Vanilla Sabayon
Ingredients: 3/4 teaspoon powdered unflavored gelatin (1/4-ounce envelope); 1/2 cup heavy cream; 1/4 cup sugar; 1 vanilla bean, split lengthwise; 1 cup well-shaken buttermilk; 3 large egg yolks; 2 tablespoons sugar; 2 tablespoons sweet dessert wine, such as sauterne; 1 tablespoon orange liqueur such as Grand Marnier; 1/2 cup mixed fresh berries such as blackberries, blueberries, and raspberries; 1/4 cup fresh strawberries, hulled and quartered; 4 (4- to 6-ounce) ramekins, kitchen blowtorch (optional)