Plum and Ginger Cobbler Recipe

Name: Plum and Ginger Cobbler Recipe
Ingredients: For the fruit base; 2 pounds ripe plums (about 6 medium), sliced into eighths; 1 1/2 tablespoons minced fresh ginger; 2 tablespoons cornstarch; 3/4 cup turbinado (raw) sugar; 1 teaspoon kosher salt; 5 star anise petals; 5 cardamom pods, lightly crushed; For the biscuit topping; 1 1/2 cups (7.5 ounces) all-purpose flour; 2 teaspoons sugar; 2 teaspoons baking powder; 1/2 teaspoon baking soda; 6 tablespoons (3/4 stick) butter, cut into small cubes and chilled; Up to 1/2 cup plus 2 tablespoons chilled buttermilk