Pre heat oven to 170 c. Grease an ovenproof casserole, place a thin layer of onions on the base.

Arrange potato slices in a spiral, making one layer, season with Salt and pepper, sprinkle with sliced onion.

Continue building layers finish with a layer of potato, lightly press down.

Add sufficient stock To come to bottom of top layer, spray with oil or dot with butter

Place in oven for approximately 45 minutes, top should be golden, check if done by inserting knife or skewer to check if tender.

Serve with meat or fish.

You can add herbs of you choice to stock, I like parsley or thyme.