Keep the screen awake with cook mode on the Good Food app.
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Method
step 1
Add the butter and flour to a pan to make a roux (sauce), add the milk whisking as you go, then add the cheese, mustard, Worcester sauce and stir until melted. Lastly beat in the egg yolk.
step 2
Season the steak with salt and pepper then add to a preheated pan, cook for 3-4 minutes per side for medium, or couple of minutes either way for rare or well done steak. Top with the cheese mixture and cook under a pre heated grill set to its highest setting and cook until topping is golden and bubbling.
step 3
Peel and chip the potatoes, keeping them chunky. Parboil for 5 minutes then drain. Transfer to a preheated baking tray then drizzle with oil and bake in an oven set at 200c (gas mark 6) for around an hour until golden. Season with salt.