
Portobello caps take center stage here, marinated in a garlicky mix of olive oil, fresh thyme, rosemary, and parsley, then brightened with lemon zest and juice before hitting a hot skillet. Searing them gill-side down first coaxes out deep, savory browning and concentrates their meaty texture, so by the time they're flipped and finished, each cap is tender, juicy, and packed with flavor. A slice of melty provolone or Swiss can go right on top in the last minute of cooking, letting it soften into every ridge of the mushroom. Toasted buns, crisp lettuce, ripe tomato, and a smear of mayo or aioli round out the build into something that eats just like a classic burger. It's a satisfying, plant-forward main that fits naturally into a vegetarian spread without missing a beat. Simple ingredients, bold herby flavor, and a quick stovetop cook make this one worth putting into regular rotation.
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Use a spoon to scrape the gills from the underside of each portobello cap and snap off the stems. Wipe the caps clean with a damp paper towel.
In a small bowl, stir together the olive oil, garlic, thyme, rosemary, parsley, lemon zest, lemon juice, salt, and pepper until combined.
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