Amethyst Blueberry Pie - The Local Palate

Ingredients

• 2 cups fresh or frozen blueberries
• 2 cups fresh or frozen cranberries
• 1½ cups plus 1 tablespoon sugar, divided
• ¾ cup cornstarch
• 2 tablespoons orange zest
• 2 tablespoons orange juice
• 2 teaspoons vanilla extract
• Pastry for 1 (9-inch) double-crust pie
• 1 cup slivered almonds
• 2 tablespoons butter
• 1 tablespoon milk
• 1 cup whipped cream for garnish