* 50 g (2oz) Butter
* 50 g (2 oz) Plain flour
* 600 ml (1 pint) Milk
* Sea salt and Freshly ground black pepper
* Freshly Grated Nutmeg (optional)
* 4 large Onions, peeled and very thinly sliced
* 4 large Potatoes, peeled and very thinly sliced
* 125 - 225 g (4-8oz) Bacon rashers, rind removed and cut into strips

===Method===
* Make a White sauce by melting the Butter on a low heat in a small pan, stir in the Flour and gradually whisk in the Milk
* Bring to the Boil stirring all the while, once smooth and thick, reduce the heat to a very low Simmer, add the seasoning and Nutmeg and leave it ticking over while you prepare the rest of the ingredients.
* Grease a Casserole dish and build up in layers of Onion, Potatoes and Bacon bits, ending with potatoes
* Pour the White sauce over the top and jiggle well to distribute the Sauce evenly
* Cover and Bake for 1 hour at 200° C (400° F - gas 6), uncover and reduce to 180° C (350° F - gas 4) and cook for 1 final hour

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