Mushroom Steak Sandwich

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Instructions:

1. 1.Quickly fry the mushrooms with salt, pepper and balsamic glaze.
2. 2.Season the steak with salt and pepper and cook until golden.
3. 3.For the sauce: mayonnaise 1, wholegrain mustard 1 (0.5 is fine too! Add a spoon of honey if you like it sweet).
4. 4.Spread the sauce on warm sourdough and pile on arugula, mushrooms and steak,
5. 5.add a pat of Butter Pantry charm-songi mushroom butter and close — done!