The Portobello mushroom is really just a large crimini mushroom, which in turn is just a brownish button mushroom! There, the secret is out... no more turning up of noses at the sight of a 'common' little button.
My sources say they all have similar nutrition levels and health benefits; but the taste gets stronger, earthier and meatier as you go from white button, to brown crimini, to portobello.
They all have merit.
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8x10 oil on canvas (needs some drying time)