please correct me if i'm wrong but i think the main aspect of normandy cider making that differentiates it from other regions/styles is the process of keeving, or reducing the amount of nutrients perfectly such that you can bottle carb while retaining some residual sugar and having the yeast run out of gas at just the right point so that you don't get bottle bombs.
how they accomplish it i have no idea (google seems to have some idea), i bet each cider maker has their own tried and tested method.