Meaty, char-grilled portobello caps take center stage here, soaked in a savory marinade of tamari, balsamic, and smoked paprika until they turn deeply caramelized and tender at the edges. The real star might be the avocado ranch — creamy mashed avocado swirled with fresh chives, dill, and a bright hit of lemon juice, spread thick on toasted buns for maximum flavor in every bite. Crisp butter lettuce, juicy tomato, and thin red onion add crunch and freshness against the smoky mushroom, giving the whole thing that classic burger-night satisfaction without any meat on the grill. It's a hearty, umami-packed handheld that comes together fast and feels like a genuine burger, not a consolation prize. This one's a natural pick for a vegetarian table, easy enough for a weeknight and impressive enough for a backyard cookout.
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In a small bowl, whisk together the olive oil, tamari, balsamic vinegar, garlic powder, smoked paprika, and black pepper. Place the portobello caps gill-side up in a shallow dish and pour the marinade over them, turning to coat. Let them sit for 15 minutes at room temperature.
While the mushrooms marinate, make the avocado ranch: mash the avocados in a large bowl until mostly smooth with a few small chunks remaining. Stir in the mayonnaise, lemon juice, chives, dill, onion powder, and salt until combined. Taste and adjust salt as needed. Press a piece of plastic wrap directly onto the surface and refrigerate until ready to use.
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