1. Slice the potato as thinly as possible (I used a boxed cheese grater).
2. Don't pre-cook the potato - you need the starch to thicken the sauce.
3. Don't try to lower the fat content of the recipe by using milk; it does not work and you end up with a far inferior dish.
After a few attempts, I was able to get this dish down to perfection; my boyfriend's comment after he'd taken his first bite: 'Yep, you've smashed it'. I think that about sums it up. A warning: this is a highly indulgent and rich dish.

