In an airtight, nonreactive container (I like Pyrex bowls for this), whisk together red wine vinegar, olive oil, garlic, maple syrup, red pepper flakes, basil, oregano, thyme, bay leaf, dill and kosher salt. Add warm mushrooms into the bowl and toss with the marinade, covering the mushrooms. Let stand 15 minutes and serve. Mushrooms will develop more flavor the longer they sit and are even better the next day if you have the time!