Step 1

Add the sliced mushrooms to glass jars or a resealable bag. I prefer to use glass jars as they double as long-term storage, and are easier to clean; my mushrooms fit in 2 quart-sized jars for this recipe.

Step 2

Whisk the balsamic vinaigrette and tamari together in a small bowl, then pour over your mushrooms. If you are using multiple storage containers try to divide it evenly. Give the mushrooms a good shake, until everything is evenly coated.

Step 3

Marinate for at least 8 hours in the fridge (or overnight). Shake the mushrooms 2-3 times while they marinate, to ensure everything is evenly coated. The mushrooms will reduce to about 1/4 of their original size once they are fully marinated, and the marinade liquid will have increased.

Step 4

Use as desired; keep leftovers in the fridge for up to two weeks.