These meaty portobello caps get marinated in a bright mix of olive oil, apple cider vinegar, and fresh thyme and rosemary before hitting a hot grill or skillet, where they turn deeply browned and tender all the way through. Piled onto a toasted bun with crisp butter lettuce and delicate carrot ribbons, they deliver all the char and savory depth of a classic burger without any meat involved. A layer of fresh mozzarella and torn basil on top adds a creamy, herby finish that makes the whole thing feel indulgent. It's a satisfying, hands-on recipe that comes together fast and eats like a real burger, making it an easy go-to for a vegetarian table. Simple, smoky, and packed with texture in every bite.
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In a small bowl, whisk together the olive oil, apple cider vinegar, thyme, rosemary, oregano, and salt until combined.
Place the portobello caps gill-side up on a rimmed plate or shallow dish. Brush the marinade generously over both sides of each cap, then let them sit at room temperature for 20 minutes.
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