Potato Gratin with Sage & Onion.

Easy and quick to make and very tasty!
Slice a potato or three as finely as possible and place a layer of them at the bottom of an oven proof dish.
Then add a layer of sliced onion and a sage leaf.
Keep layering the potato, onion and sage - occasionally adding a bit of butter and a light sprinkling of seasoning.
Grate some good cheese on top - I used Lincolnshire Poacher - and pour a little cup of milk over to.
Place in an oven at 180 degrees for about 35-40 mins until the potato has cooked through.