💦 Make the Marinade:
In a small bowl, whisk together olive oil, balsamic vinegar, garlic (minced), soy sauce, thyme, rosemary, salt, and pepper.

🍄 Prep the Mushrooms:
Wipe mushrooms clean with a damp cloth or paper towel.
Place them gill-side up in a shallow dish or zip-lock bag. Pour marinade over the mushrooms and let sit for 15–30 minutes, flipping once if needed.

🔥 Grill:
Preheat grill (or grill pan) to medium-high heat.
Grill mushrooms for about 5–6 minutes per side, or until tender and nicely charred. Baste with leftover marinade during grilling for extra flavor.

🍽 Serve:
Slice and serve as a side, or place whole on a bun as a meatless burger.
Great with quinoa, couscous, or a fresh salad.

🔥 Pro Tips:
Don’t skip the marinade — portobellos are sponges and soak up tons of flavor.
Want a smoky vibe? Add a dash of smoked paprika to the marinade.
For extra richness, melt a slice of cheese (like provolone or goat cheese) on top near the end of grilling.