Pear and Dried Cherry Scrunch

Name: Pear and Dried Cherry Scrunch
Ingredients: 8 firm, ripe pears, such as Anjou or Bosc (about 4 pounds —peeled, cored and cut into 1-inch dice); 1 cup dried sour cherries (about 4 ounces); ½ cup light brown sugar; 3 tablespoons fresh orange juice; 2 tablespoons fresh lemon juice; 1 teaspoon finely grated lemon zest; 1 teaspoon cinnamon; 4 tablespoons unsalted butter (cut into small pieces); 1 cup all-purpose flour; 1 cup quick-cooking oatmeal; 1 cup chopped walnuts (4 ounces); 1 stick unsalted butter (8 tablespoons cut into small pieces); Whipped cream, crème fraîche or vanilla ice cream (for serving)