Heat vinegar and cumin in a non-aluminum pan until boiling. Simmer five minutes. Place mushrooms and shallots in a small pan (not aluminum) and cover with a saucer and weight to hold it down. Pour vinegar mixture over mushrooms to cover. Return pan to stove and bring to a simmer. Simmer 1 to 15 minutes or until mushrooms are just tender. Remove from heat and let mushrooms cool in the vinegar.
Drain and refrigerate until ready to serve
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