Bring water, vinegar, sugar and salt to a boil, then remove from heat.
Meanwhile, slice mushrooms and other ingredients as desired, and place into a jar with a well fitting lid.
Pour hot brine over mushrooms, then seal jar with lid. Leave on the counter for 1 hour then refrigerate for at least 24 hours.
Enjoy!
Notes
Ingredient ratios may be scaled up or down. You may also adjust amount of any ingredient based to suit personal preference. This is a starting point. See flavor combinations and variations in the post!Pickled mushrooms are good in the refrigerator for up to 2 months.