In a large bowl, combine diced apples with lemon juice.
Add cornstarch, lemon zest, sugar, cinnamon, nutmeg and vanilla. Mix well.
Dump apple mixture into a greased 10X13 casserole dish.
Pour about a 1/2 cup of salted caramel over the apples, sprinkle pecans on top and pour in apple juice.
Dump cake mix right over the top, spreading evenly.
Melt butter over low heat on the stove and pour evenly over entire dish, making sure that the butter covers every morsel as you don't want white patches to develop. This will ensure an even golden brown color over the entire pie.
Place the dish in a 350 degree oven for about 50 minutes. It should be bubbly, brown and crusty all over!
Serve immediately out of the oven with a scoop of ice cream, more salted caramel and pecans. Say grace and enjoy!