In a medium bowl, combine brown sugar, lemon juice, cinnamon and vanilla, mix well
Add sliced apples and mix well, set aside
Crust
In a medium bowl, combine flour, brown sugar, cinnamon, salt and mix well
Pour in melted butter, mix until it before a dough ball
Press onto a pie pan or tart pan, try to be as even as possible.
Preheat oven to 350F
Put the apple slices into the tart carefully as the fruit would be macerated and breaks easily. Try to pack it in as tight as possible, since the apples shrink when baked.
Sprinkle some sugar on top of the apples for some carmelization, and space out the cubes butter on the apples.
Bake for 60 minutes, remove from oven, and brush the melted apricot preserve for that professional bakery shine.