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    Delia's Onion and mustard sauce

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    Delia's Onion and mustard sauce

    • Preparation time: 10 minutes
    • Cooking time: 30 minutes
    • Total time: 40 minutes 40 minutes

    Ingredients

    1 large onion, peeled and chopped
    40g block butter, cut into chunks
    25g sauce flour or plain flour
    1 heaped teaspoon mustard powder
    175ml milk
    175ml gammon stock
    1 heaped teaspoon grain mustard
    Salt and freshly milled black pepper

    You will also need a Delia Online Little Gem ‘Sauce’ pan (heavy gauge aluminum, measuring 16cm by 8cm or similar)

    Method

    Melt 25g of the butter in the saucepan and add the onion, and when you've stirred it so it's nice and buttery, let it cook on a low heat for about 20 minutes. It's important not to let it colour, so give it a few stirs from time to time. Now, using a wooden spoon, stir in the sauce flour and the powdered mustard till smooth, then add the milk a little at a time, still stirring, increase the heat to medium, then gradually add the stock - keep stirring after each addition until its all in. Now turn the heat down low and let it barely simmer for 5 minutes. 


    Finally stir in the grain mustard, the rest of the butter and some seasoning, then pour into a warmed serving jug. This is excellent served with boiled gammon or a bacon joint.

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    Recipe adapted from Delia’s Complete How to Cook published by BBC Books 2009

    © Delia Smith 2014

    To watch this recipe video, click here

    See also: Delia's All-in-one white sauce

    For more information about Delia's Online Cookery School go to www.deliaonline.com

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