
Meaty portobello caps take on a deep marinade of smoky paprika, garlic, and balsamic before hitting a hot pan, where they brown, caramelize at the edges, and turn tender all the way through. The real star is that chipotle-cashew spread — blitzed until silky and packed with smoky, tangy heat, it's the kind of condiment you'll want to put on everything. Piled onto toasted buns with crisp lettuce, juicy tomato, sharp red onion, and creamy avocado, this burger delivers all the char-grilled satisfaction of a classic cookout staple without any actual meat in sight. It's hearty enough to silence anyone who doubts a mushroom can headline a burger, and it comes together with pantry staples and one skillet. A genuinely satisfying, plant-forward main that fits easily into a vegetarian spread — great for backyard grilling season or a fast weeknight dinner.
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Place the raw cashews in a bowl, cover with cold water, and soak for 20 minutes. Drain and set aside.
While the cashews soak, whisk together the olive oil, tamari, balsamic vinegar, smoked paprika, garlic powder, and black pepper in a shallow bowl or baking sheet large enough to hold the mushroom caps in a single layer. Add the portobello caps gill-side up, spoon the marinade over them, and let them sit for 15–20 minutes, turning once halfway through.
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