Apple and Pear Crisp

Name: Apple and Pear Crisp
Ingredients: 2 pounds ripe Bosc pears (4 pears); 2 pounds firm Macoun apples (6 apples); 1 teaspoon grated orange zest; 1 teaspoon grated lemon zest; 2 tablespoons freshly squeezed orange juice; 2 tablespoons freshly squeezed lemon juice; 1/2 cup granulated sugar; 1/4 cup all-purpose flour; 1 teaspoon ground cinnamon; 1/2 teaspoon ground nutmeg; 1 1/2 cups all-purpose flour; 3/4 cup granulated sugar; 3/4 cup light brown sugar, lightly packed; 1/2 teaspoon kosher salt; 1 cup old-fashioned oatmeal; 1/2 pound (2 sticks) cold unsalted butter, diced