Embark on a culinary adventure with these incredible Grilled Teriyaki Portobello Burgers! Imagine succulent portobello mushroom caps, marinated in a rich, homemade teriyaki glaze, expertly grilled to tender perfection. Each savory “burger” is then layered with sweet, charred pineapple, thinly sliced grilled red onion, a generous dollop of our signature honey wasabi mayo, and a scattering of fresh, vibrant sprouts. Whether you prefer to embrace a light, refreshing wrap in crisp butter lettuce leaves or opt for your favorite toasted bun, this vegetarian masterpiece promises a symphony of flavors and textures that will redefine your burger experience. Get ready for a delicious, satisfying, and utterly unforgettable meatless meal that’s bursting with irresistible umami.

The Irresistible Allure of Meatless Meals
More and more, my kitchen is gravitating towards vibrant, plant-based creations. There’s a certain freshness and creativity that vegetarian and vegan recipes inspire, making them not just alternatives, but often the star of the show. Perhaps it’s a past life calling, or simply a deep appreciation for nature’s bounty, but vegetables, especially the versatile mushroom, have found a permanent and prominent place on my plate. If you haven’t yet explored the wonderful world of portobello burgers, now is the perfect moment to dive in. I am wholeheartedly, 100% on team portobello, and once you try this recipe, I’m confident you will be too.
From Skepticism to Portobello Perfection
Admittedly, I was a skeptic at first. The idea of a mushroom masquerading as a beef patty seemed, well, ambitious. Who wouldn’t be at least a little wary? Yet, over the past year, I’ve gradually introduced portobellos into various recipes that traditionally call for meat. I’ve grilled them for mouth-watering quesadillas, pan-fried them for sizzling fajitas, and even use their smaller “baby bella” cousins in almost every mushroom-inclusive dish. The transformation from skepticism to full-blown admiration has been complete. Today, however, we celebrate the ultimate portobello experience: the glorious Grilled Teriyaki Portobello Burger.
This burger isn’t just a substitute; it’s a culinary experience in its own right. We start with thick, hearty portobello caps, known for their robust texture and earthy flavor, which serve as the ideal canvas for our sweet and savory homemade teriyaki sauce. These mushroom “patties” are then grilled until they develop a beautiful char, becoming tender and deeply caramelized. The magic continues with a slice of creamy gouda cheese, melting into blissful decadence over the hot mushroom. The entire creation is nestled into crisp butter lettuce leaves – a lighter alternative to a bun – and generously adorned with sweet grilled red onion, a vibrant slice of grilled pineapple, and delicate fresh sprouts. To elevate this already delicious burger, I’ve crafted a unique honey wasabi mayo, a secret weapon that perfectly binds all these incredible flavors together. It’s a harmonious blend of sweet, savory, and a hint of spicy, creating a truly unforgettable meal.

The flavor profile is simply irresistible: a harmonious dance between sweet, spicy, and umami-rich notes. It’s truly a delight for the palate, designed to satisfy even the most discerning burger aficionado.

Gather Your Ingredients for a Flavorful Feast
To bring these fantastic Grilled Teriyaki Portobello Burgers to life, you’ll need a selection of fresh and flavorful ingredients. For the star of the show, pick up four large portobello mushroom caps. You’ll also need your favorite teriyaki sauce – whether you opt for a high-quality store-bought version or whip up a batch of homemade, its savory-sweet notes are essential. For the toppings, prepare fresh pineapple slices and rings of red onion, both destined for a delicious grill. Creamy gouda cheese, either pre-sliced or freshly grated, will add a wonderful melty finish. Crisp butter lettuce leaves are perfect for wrapping, providing a refreshing crunch. Finally, for the distinctive honey wasabi mayo, gather mayonnaise (homemade or store-bought), a clove of fresh garlic, golden honey, and, of course, a good quality wasabi paste.

Crafting the Perfect Honey Wasabi Mayo
When selecting wasabi, you might encounter two main types at your local grocery store: a pre-made paste, which often contains a long list of unfamiliar ingredients, or a powdered form that allows for a purer, more controlled flavor. I often prefer the latter, as it typically has minimal, recognizable ingredients. To create fresh wasabi paste from powder, simply combine a small amount of the powder with a few drops of water, stirring until it forms a thick, vibrant green paste. This method gives you complete control over the pungency and freshness of your wasabi, ensuring the best flavor for your mayo.

Once your wasabi paste is ready, the honey wasabi mayo comes together in minutes. In a small bowl, combine ½ cup of mayonnaise with one small clove of freshly grated garlic (this should yield about ¼ to ½ teaspoon). Add 1 teaspoon of honey for that touch of sweetness. Now, for the wasabi: start with a very small, pea-sized amount of the paste. Wasabi can be quite potent, so it’s crucial to add it gradually and taste as you go. Whisk everything together thoroughly, and then sample the mayo. If you desire more heat, add another tiny amount of wasabi and repeat the whisking and tasting process until you achieve your preferred level of spice. A little goes a long way to awaken the flavors!

Continue to whisk and taste, ensuring a perfectly balanced and creamy condiment that will elevate your portobello burgers to new heights. Once satisfied, set it aside or refrigerate until ready to serve.

Grilling to Perfection: Teriyaki Portobello Burgers
Preheat your grill to a medium-high heat, aiming for approximately 400℉ (or 200℃). While the grill heats up, prepare your ingredients. Gently wipe any dirt from the portobello mushrooms; remember, mushrooms should generally not be rinsed under water as they can absorb too much moisture. Once clean, brush the underneath side of each portobello cap generously with your teriyaki sauce. Then, give both the portobellos and your slices of fresh pineapple and red onion a light spritz with an olive oil mister. This olive oil coating is key to preventing them from sticking to the grill grates and helps achieve that beautiful char.

Once your grill is piping hot and ready, carefully place the pineapple slices, onion rings, and portobello mushrooms onto the hot grates. Ensure the teriyaki-brushed side of the portobellos is facing down. Now, generously brush the tops of the mushrooms with even more teriyaki sauce. Close the grill lid to lock in the heat and flavors. Grill for approximately 8 to 10 minutes, or until you see distinct, appealing grill marks forming on the underside of the portobellos and the vegetables begin to soften and caramelize.

With careful precision, use tongs to flip the portobello burgers, pineapple, and onion slices to their uncooked sides. This ensures even cooking and beautiful grill marks on both sides. Close the grill lid once more and continue grilling for an additional 3 to 4 minutes. During this time, the mushrooms will become fully tender, and the pineapple and onions will achieve perfect sweetness and char.

Observe the beautiful char on the grilled onions and pineapple – a testament to their readiness. These caramelized toppings will add incredible depth of flavor and sweetness to your burgers. Keep them warm while the portobellos finish cooking.

The portobello caps, now beautifully softened and infused with teriyaki flavor, are almost ready. The rich, earthy aroma filling the air is a promise of the deliciousness to come. Continue grilling for the specified time, ensuring they are cooked through but still retain a satisfying texture.

Once the mushrooms are nearly done, open the grill lid and crown each portobello burger with a slice of gouda cheese. If your cheese needs a little encouragement to melt into a gooey, irresistible layer, simply close the lid for just a minute or two. The residual heat will transform the cheese into cheesy bliss. Once melted, carefully remove the completed burgers, along with the grilled pineapple and red onion, from the grill. Transfer them to a tray or plate, ready for assembly.

Assembling Your Masterpiece: The Teriyaki Portobello Burger
The aromas wafting from your kitchen right now must be absolutely incredible! It’s time to bring all these delicious components together and build your mouth-watering burgers. This is where the magic truly happens, transforming simple ingredients into a gourmet, meatless delight. Prepare your plates and get ready for a feast for the senses.

To assemble, arrange a few crisp butter lettuce leaves on each of your four plates, creating a natural and refreshing base. Spoon a generous dollop of your homemade honey wasabi mayo onto the lettuce. Carefully place a grilled teriyaki portobello burger on top, followed by slices of the sweet grilled red onion and caramelized pineapple. If you crave an extra burst of flavor, drizzle a little more teriyaki sauce over the top. Finish by garnishing with a delicate sprinkling of fresh sprouts for added crunch and nutrition, and a dash of sesame seeds for an extra touch of visual appeal and nutty flavor. These burgers are not just a meal; they’re an experience, ready to be savored.
These Grilled Teriyaki Portobello Burgers are truly exceptional:
- **Incredibly Juicy:** The portobello caps, when properly grilled, retain their moisture, offering a satisfyingly juicy bite.
- **Bursting with Flavor:** The homemade teriyaki glaze, combined with the sweet pineapple, savory onions, and zesty mayo, creates an explosion of taste in every mouthful.
- **Effortlessly Easy:** Despite their gourmet appearance and taste, these burgers are surprisingly simple to prepare, making them perfect for weeknight dinners or casual weekend gatherings.
- **Utterly Delicious:** They are a delightful testament to how flavorful and satisfying a meatless meal can be, sure to impress vegetarians and meat-lovers alike.

Enjoy this fantastic recipe! If you try these Grilled Teriyaki Portobello Burgers, I’d absolutely love to hear about it. Share your culinary creations by snapping a photo and tagging me on Twitter or Instagram!


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Grilled Teriyaki Portobello Burgers with Honey Wasabi Mayo
Ingredients
FOR THE WASABI MAYO:
- 1/2 cup mayonnaise, homemade or store-bought
- 1 small clove garlic, grated or finely minced (about 1/4 to 1/2 teaspoon)
- 1 teaspoon honey
- wasabi paste, to taste*
FOR THE TERIYAKI PORTOBELLO BURGERS:
- 2/3 cup teriyaki sauce
- 4 large portobello mushroom caps, tops wiped clean, stems removed and discarded
- 4 slices fresh pineapple
- 4 thick slices red onion, should hold up when grilled
- olive oil spray, mister
- 8 butter lettuce leaves, for serving (or use your favorite hamburger bun)
- reserved teriyaki sauce, for serving
- sprouts, for serving (optional)
Equipment
- Staub Pure Grill, Graphite Grey, 10 – Graphite Grey (1203018)
Instructions
MAKE THE HONEY WASABI MAYO:
- In a small bowl, whisk together mayo, garlic, honey and desired amount of wasabi paste. Refrigerate until ready to serve.
- *I use wasabi powder and mix it with a little water until it forms a paste. Then I add a pea-size amount at a time until I get the flavor I want. A little wasabi goes a long way, so only add a little at time and taste as you go.
MAKE THE PORTOBELLO BURGERS:
- Preheat your grill to medium-high or about 400℉ (or 200℃).
- Brush the underneath side of the portobellos with the teriyaki sauce, and spritz with the olive oil mister. Lightly mist both sides of the pineapple and onion slices with olive oil as well. This helps to keep them from sticking when grilling.
- Once your grill is hot, place the portobello burgers (teriyaki or underneath side facing down), and the pineapple and onion slices onto the hot grates. Generously brush more teriyaki sauce on the tops of the mushrooms. Close your grill lid and grill for 8 to 10 minutes or until good grill marks form.
- Then carefully turn the portobello burgers, pineapple and onion slices. Close the grill and continue grilling for 3 to 4 minutes more.
- Open the grill and top the burgers with slices of gouda cheese. Close the lid if the cheese needs help melting, it should only take a few minutes. Remove the burgers, grilled pineapple and red onion.
SERVE:
- Divide a few butter lettuce leaves onto four plates. Add a dollop of the honey wasabi mayo and top with a grilled teriyaki portobello burger, slices of grilled red onion, pineapple and more teriyaki sauce if desired. Garnish with sprouts and a sprinkle of sesame seeds.
Nutrition Facts
Serving: 1 burger, Calories: 304kcal, Carbohydrates: 24g, Protein: 6g, Fat: 21g, Saturated Fat: 3g, Polyunsaturated Fat: 13g, Monounsaturated Fat: 5g, Trans Fat: 1g, Cholesterol: 12mg, Sodium: 2028mg, Potassium: 588mg, Fiber: 3g, Sugar: 19g, Vitamin A: 1061IU, Vitamin C: 42mg, Calcium: 40mg, Iron: 2mg