Wash and dry 6-8 apples. You can add a couple more if you like your apple crumble loaded with extra fruit.
Peal the apples, half them, and remove the seeds. Take a large mixing bowl and using a grater, grate the peeled slices of apples on the large holes into the bowl.
Add cinnamon, brown sugar, and 1 tbsp of lemon juice, and mix it all together.
In the meantime, preheat the oven to 350 degrees Fahrenheit (180 Celsius).
While the oven is heating, in a medium mixing bowl, add flour, almond meal, sugar, salt, and chopped butter (at room temperature).
Combine it together to form a ball.
In a separate bowl, combine eggs, one tbsp of lemon juice, and vanilla and mix it well together until the mixture becomes fluffy.
Combine both of the mixtures together (wet and dry)with a spatula until you have one consistent mixture.
Take a large non-stick baking sheet and spread the mixture gently onto it. If you don't have a non-stick baking sheet, take a small slice of butter and thinly butter the surface and the sides using your fingers, and then powder it with some bread crumbs. This trick works like magic when you don't want your dough to stick to the surface.
Bake your dough for 25 minutes, then remove it from the oven, and using a fork puncture the dough throughout.
While the dough is baking, make the crumble. To do that, combine butter, sugar, and flour and using your fingers work the ingredients together until small clumps are formed.
Next, take the grated apples and spread them evenly over the baked dough.
Add the crumble on top and bake for another 30 - 35 minutes.
Remove from the oven and place it on a cooling rack and wait 10-15 minutes for the apple crumble to cool off.