Add the lemon juice and white sugar. Sprinkle in half of the ground cinnamon. Toss everything together until the apples shine.

Butter your 9-inch square baking dish well. Pour the apple mixture into the dish. Spread them out so the layer is flat.

In a separate bowl, combine flour and sugars. Add the remaining cinnamon and the pinch of salt. Whisk these dry ingredients together gently.

Cut the cold butter into small cubes. Add the butter cubes to the flour mixture. Use your pastry cutter to mix them.

Stop mixing when you see pea-sized crumbs. Do not let the butter melt. The mixture should look like coarse sand.

Sprinkle the topping over the apple layer. Cover every corner of the baking dish. Do not press the topping down hard.

Place the dish in a preheated oven. Bake at 375 degrees for fifty minutes. The top should be a golden brown.