Cobbler

Filling 5 cups fresh fruit 1/2 cup sugar Spices (recommended: cinnamon, nutmeg, cardamom) 1/2 teaspoon salt 1 tablespoon cornstarch 1 tablespoon fresh lemon juice, and lemon zest, if desired Topping 1/2 recipe Buttermilk Biscuit dough, recipe follows Buttermilk Biscuit 3 cups flour 3 tablespoons sugar 4 teaspoons baking powder 1 1/2 teaspoons salt 1 teaspoon baking soda 3/4 cup (1 1/2 sticks) cold unsalted butter, cut into small pieces or grated 1 cup buttermilk