1
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Saute' the onion in olive oil over medium heat until slightly browned, 2-3 minutes.
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2
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Add the mushrooms, cover, and simmer for 15 minutes.
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3
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Add the soy sauce, thyme, pepper and bring to a boil.
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4
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Add the cornstarch and stir until thickened, 2 minutes. Add salt if needed, and garnish with chopped parsley if desired.
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5
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Soup variation: Add 1-2 C broth (or 1/2 evaporated milk) at the end. Cook another 2-4 minutes, stirring occasionally, until thickened.
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