Mix pickling spice with vinegar.
Add salt and sugar, bring to boil, and strain over mushrooms.
Add oil and garlic.
Keep in refrigerator.
Shake jar well 2 or 3 times a day.
Add more salt, if necessary, after 24 hours.
Do not use for 2 or 3 days.
These mushrooms will keep for 1 month in covered jar in refrigerator.