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Balsamic Portobello Burgers

Balsamic Portobello Burgers

From Sarah Lipoff, POPSUGAR Food

Notes

Serve alongside your favorite salad or a handful of chips for a dinner in less than 20 minutes.

Ingredients

  1. 1/4 cup olive oil
    1/4 cup balsamic vinegar
    1/4 teaspoon oregano
    Coarse salt and ground pepper
    4 slices red onion
    8 portobello mushrooms (about 1 pound total), stems removed
    4 brioche hamburger buns
    4 slices gruyère cheese
    4 lettuce leaves

Directions

  1. In a bowl, whisk together the oil, vinegar, oregano, and a dash of salt and pepper. Toss the mushrooms several times in the marinade to fully coat. Marinate at room temperature for 30 minutes or up to 2 hours.
  2. Lightly oil grates, and heat your grill to medium. If using charcoal, you can toss the portobello burgers over nice, hot coals. Or, if using a grill pan, preheat on high for 2 minutes. Grill mushrooms, covered, 3 to 4 minutes per side, or until lightly charred and tender. If using a grill pan, cook for 5 minutes per side, then flip.
  3. Slice 4 rounds from the red onion and dip in the remaining portobello marinade while holding the rings together. Place each round flat on the grill and cook alongside the portobellos for 3 to 4 minutes on each side.
  4. Top 4 of the 8 portobellos with a slice of gruyère and cover until cheese is melted. If using a grill pan, cover with tinfoil to help the cheese get gooey.
  5. Assemble the burgers in this order: bottom bun, lettuce leaf, a slice of grilled red onion, gruyère-topped portobello mushroom (cheese side up), another portobello (cap side up), top bun.
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