01 - In a medium mixing bowl, whisk together the balsamic vinegar, olive oil, minced garlic, soy sauce, chopped herbs, black pepper, and salt until well combined.
02 - Add the trimmed mushrooms to the marinade and toss thoroughly to ensure even coating. Allow to marinate for 15 to 30 minutes for optimal flavor penetration.
03 - If using wooden skewers, soak them in water for at least 15 minutes to prevent burning on the grill.
04 - Remove mushrooms from the marinade and thread them onto the prepared skewers, spacing them evenly for uniform cooking.
05 - Preheat an outdoor grill or grill pan to medium-high heat, approximately 400°F.
06 - Place skewers on the hot grill and cook for 8 to 10 minutes, turning occasionally, until the mushrooms are deeply browned and tender throughout.
07 - Transfer the grilled skewers to a serving platter. Sprinkle with chopped fresh parsley and drizzle with balsamic glaze if desired. Serve immediately while hot.