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jamesfwguy
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Half fill a sink with cold water.
Combine the mustard, flour and sugar, with about a teaspoon of salt and a good grinding of pepper, in a heavy-based saucepan. Add a little of the milk and stir to mix to a smooth paste, then put on a gentle heat and keep adding the milk, and stirring as you do so. I find my Magiwhisk the best thing to banish lumpiness here, but it's not a difficult operation whatever you use.
When all the milk's in, add the beaten egg and vinegar and keep on whisking until it's beginning to thicken. When the mixture's got the texture of single cream, whisk in the oil then plunge the pan in the sink of cold water and continue whisking for a while.
When it's cool (you can pour into a bowl then put the bowl over ice if you want speedy cooling), cut the tomatoes in half and arrange on one huge plate or two fairly large ones.
Drizzle a few spoonfuls over (don't drench: think Jackson Pollock) then add some chopped spring onions or chives. Unexpected heaven.