Heat the oven to 350 degrees. Butter a 13-by-9-inch baking dish. In a medium bowl, combine the flour, 1 cup/200 grams of the brown sugar, oats, pecans and salt. Add the butter, and stir with a fork until the crumbs are evenly moistened.
Add the apples to the buttered baking dish and toss with the remaining 1/2 cup/100 grams brown sugar, cinnamon and lemon juice. Spread the apples into an even layer. Press the crumb mixture together to create clumps of different sizes, and sprinkle on top of the apples. Transfer to the oven, and bake until the apples are tender and the crumb topping is crisp and deep golden brown, about 50 to 60 minutes. Serve warm or at room temperature.
Find any recipe, add your own, make grocery lists easily from recipes. Enter any 3 ingredients and BigOven will tell you what you can make. It's free! (4.5/5 stars)