Flip the pancake over and cook it for another 3 minutes on its uncooked side. Bake more pancakes from the remaining batter and transfer them to a plate. Core and dice the green apples. In the same warm pan you baked the pancakes in, add the cold butter, the diced apple and the remaining caster sugar.
Place the pan over medium heat. Once the butter has melted, cook the apples for 3 minutes. Then pour in the calvados.
Turn the heat low and bake the apple for another minute. Keep them crunchy. Then take the pan off the heat. Spread the freshly baked pancakes with the dulce de leche. Place them onto plates and top with the cooked apples. Serve hot.