Apple And Mixed Berry Crumble

Name: Apple And Mixed Berry Crumble
Ingredients: 2 Granny Smith apples—peeled, cored, halved lengthwise and sliced paper thin; 1/4 cup fresh lemon juice; 2 tablespoons granulated sugar; 3/4 teaspoon cinnamon; 1 pint blueberries (3 cups); 1 pint raspberries (3 cups); 2 cups quick-cooking oats; 2 cups lightly packed light brown sugar; 1 cup all-purpose flour; 1 teaspoon finely grated fresh ginger; 1/2 teaspoon salt; 2 sticks plus 6 tablespoons unsalted butter, cut into small pieces; Heavy cream, for serving