Clean the portobello mushrooms and remove the stems. In a bowl, combine the olive oil, balsamic vinegar, minced garlic, salt, and pepper.
Brush the mushroom caps with the marinade mixture, and let them stand for at least 10 minutes to allow the flavors to meld.
Heat a skillet or grill to medium-high heat. Cook the marinated mushroom caps for 4-5 minutes per side, until softened and lightly caramelized.
During the last minute of cooking, place a slice of cheddar cheese on each mushroom cap and cover to allow the cheese to melt.
Halve the hamburger buns and lightly toast the cut sides in a dry skillet.
Spread a little vegan mayonnaise and Dijon mustard on the bottom bun. Add a lettuce leaf, then the cheese-covered grilled portobello mushroom. Top with thinly sliced tomato and red onion, and finally the top bun.
Serve the assembled mushroom burger immediately, accompanied by sweet potato fries or a fresh salad.
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