Thick portobello caps soak up a bold marinade of olive oil, tamari, balsamic, garlic, and thyme before hitting a hot grill, where they develop deep char marks and a juicy, tender bite. The caps get finished right on the grill until the tops are perfectly warmed through, then nestled onto toasted buns with crisp butter lettuce, ripe tomato slices, and a few rings of sharp red onion. A swipe of mustard on the bun adds a tangy kick if you want it, and the whole thing comes together as a hearty, smoky, umami-packed burger that eats like the real deal. It's a satisfying centerpiece for a backyard cookout and a solid pick for a plant-based dinner rotation. Every element here — from the marinated mushroom to the fresh produce — is built to keep this one firmly in vegan territory without sacrificing any of that classic burger experience.
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In a small bowl, whisk together the olive oil, tamari, balsamic vinegar, minced garlic, dried thyme, and black pepper until combined.
Place the portobello caps gill-side up in a shallow dish or on a rimmed plate. Brush the marinade generously over both sides of each cap. Let them marinate at room temperature for 20 minutes.
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