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
For the topping:
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