| http://www.w3.org/ns/prov#value | - To make the cheese sauce melt the butter in a pot and stir in the flour and cook gently for a couple of minutes, now gradually add the milk whiskjing all the time until smooth, bring to the boil and simmer gently for 10 minutes to thicken, add the 2 types of mustard, the nutmeg and the cheeses, keeping back a bit of each cheese for the top.
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