Mise en Place

• Preheat oven to 425 degrees F (if using)
• Wash and dry fresh produce.
• Remove the stems from the mushrooms.
• Peel and mince garlic.
• Peel, pit, and slice avocado (if using).
• Measure out the ingredients.

Prepare Mushroom Seasoning

• In a bowl, whisk together the vinegar, salt, pepper, garlic and oil.
• Pour over the mushroom caps and make sure they are coated evenly.
• Place them on a baking tray, rounded side down.
• Let sit for about 15 minutes. Don’t rinse the bowl, because you’ll use any oil and vinegar residue to dress the spinach.

Prepare the Portobello (choose one cooking method)

• Stove Top/grill cooking:
  • Prepare a medium-hot grill or heat a heavy skillet over medium-high heat, or preheat an electric grill or panini pan on medium-high.
  • Season the mushrooms as desired with salt and pepper.
  • Place the mushrooms on the hot grill or pan, rounded side down.
  • Cook for about 6-8 minutes, depending on thickness, until lightly browned and moist.
  • Turn over and cook for another 6 minutes. Turn over for a minute to reheat the top, then flip back over and place the cheese on top.
  • Continue to cook until the cheese melts.
• Panini grill:
  • Heat to high and cook 6-8 minutes.
  • Open the grill and place the cheese on top. Wait for it to melt.
• Oven cooking:
  • Preheat oven to 425°F.
  • Place mushrooms on the baking tray with rounded side down.
  • Place baking tray in the oven and roast for 15-20 minutes, until cooked through.
  • Remove tray from oven and flip mushroom caps.
  • Place cheese on rounded side. Allow to melt.

Prepare the Burgers

• In a medium bowl, toss spinach in oil and vinegar to lightly dress.
• Place a mound of spinach on the bottom half of each hamburger bun and place the mushrooms, rounded side up, on top of the spinach.
• Top with your choice of condiments.

Serve

• Serve and enjoy!