To make the herb gremolata; combine all the ingredients into a small bowl and stir to combine. Set aside until serving.
To make the butterbean mash; add the butter, garlic and leek to a medium size saucepan on medium heat. Sauté until softened, follow by adding the drained butter beans, marjoram and milk. Roughly mash the beans so the mash is still chunky.
Once the mash has come up to heat, stir through the parmesan cheese, a pinch of salt and freshly cracked pepper. Set aside.
Heat a frying pan on medium heat and add the butter. Once it has melted add the portobello mushrooms and sauté until golden.
To serve, divide the butterbean mash between two plates, and add the sautéed portobello mushrooms. Finish off with a couple of spoons heaped with herb gremolata over the top and an extra drizzle of olive oil.
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