Melt the butter in a heavy bottomed sauce pan over a low heat.
At the same time in another pan bring the ale to the boil.
When the butter has melted add the flour to the pan and beat until it forms a smooth paste.
Add the ale to the flour and butter and mix until combined.
When the ale has been combined and you have a smooth mixture again add the cheddar and return to the heat, stirring all the time, until al the cheese has melted. Remove from the heat and leave until cool.
Beat the egg yolks and wholegrain mustard into the mixture.
Season to taste with salt and pepper.
Preheat the grill and lightly toast the bread.
Spread the cheese mixture evenly between all 8 slices of toast and return to the grill until golden and bubbling.
Top with either a poached egg or bacon (or both if you're feeling like you want to indulge!)
Serve with a light salad.
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