Rhubarb and Raspberry Pie With Oatmeal Crumble

Ingredients (15)

• 1 single pie crust
• ¾ cup old fashioned oats
• ½ cup all-purpose flour
• ½ cup packed light brown sugar
• ½ teaspoon salt
• 1/2 teaspoon cinnamon
• ¼ teaspoon ground ginger
• 6 tablespoons cold salted butter
• 4 cups rhubarb
• 3 pints raspberries
• ½ cup packed light brown sugar
• ¼ cup granulated sugar
• 1/4 cup instant tapioca
• zest of 1 lime
• ½ teaspoon ground cardamom