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MAKE PORTOBELLO GRAVY:.
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Heat oil in a medium saucepan over medium heat.
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Add onion and garlic; cook, stirring often, until softened, about 5 minutes.
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Add mushrooms and cook, stirring often, until they begin to release their juices, about 10 minutes.
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5
Add broth, tamari (or soy sauce), thyme and sage; simmer for 10 minutes.
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6
Mix cornstarch and water in a small bowl.
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Stir into the sauce and simmer, stirring often, until slightly thickened, about 10 minutes more.
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Season with pepper; if you prefer a smooth gravy, pass it through a fine sieve (discard mushrooms and onions).
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9
MAKE POTATOES:.
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Place potatoes and garlic in a large pot, cover with lightly salted water and bring to a boil.
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Cover and cook over medium heat until the potatoes are tender, about 20 minutes.
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12
Drain, reserving cooking liquid.
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13
Return the potatoes and garlic to the pot; Add butter (or oil).
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14
Mash the potatoes with a potato masher, adding 1/2 to 1 cup of the reserved liquid to make a creamy consistency; season with salt and pepper.
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15
Transfer the mashed potatoes to a warmed serving bowl and serve with Portobello Gravy.
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16
MAKE AHEAD TIP:
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Keep the potatoes hot, covered with parchment or wax paper, over a pan of barely simmering water for up to 1 hour.