Stir-fry onion in a heavy saucepan over medium heat, adding broth, wine or water as necessary. Allow onion to brown a little, scrape the pan, add liquid, and let it brown more, but watch carefully so it doesn't burn. Add garlic and sliced mushrooms and continue cooking until mushrooms are soft. Add vegetable broth, wine or water as necessary to keep from burning.
Add 1 c. of stir, stir and continue cooking. Mix whole-wheat flour and miso in the remaining cup of water, stir then add to the mushrooms and stir again. Add sherry (optional).
Continue cooking until gravy thickens. Add pepper to taste. Keep warm over low heat until serving. Add extra miso or low-sodium tamari to taste, but keep in mind that using vegetable broth instead of water intensifies the flavor.
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