Peel and chop apples into cubes.
Add apples, sugar, cinnamon to saucepan.
Pour in lemon juice and water.
Cook on medium heat until soft.
Stir frequently to avoid sticking.
Add butter and vanilla. Stir gently.
Let the mixture cool completely.
Cube the pound cake into squares.
In trifle dish, layer pound cake first.
Add a layer of apple mixture.
Drizzle caramel sauce generously over apples.
Spoon whipped topping on next layer.
Repeat layers until ingredients are done.
Finish with whipped topping and caramel.
Sprinkle chopped pecans if using.
Chill in fridge for 1 hour.
Serve cold with a caramel drizzle.