Portobello Burger with Caramelized Onions

 

I realize that this picture does not look at all appetizing, but I assure you, these portobello burgers are amazing! Last year I was in a bit of a cooking funk, so we got a subscription to one of those meal kits where they send you the recipe and ingredients, and I have made portobello mushroom burgers several times since then. Here's what you need:

Ingredients:

• 2 portobello mushrooms
• 2 teaspoons olive oil
• 1 teaspoon garlic powder
• 1 tablespoon butter
• 1 onion
• 2 tablespoons balsamic vinegar
• cheese of your choosing (goat cheese, swiss, cheddar, whatever floats your boat)
• 2 slices of tomato
• 2 hamburger buns, toasted (pretzel buns are pretty tasty)

Melt the butter in a skillet and slice the onion. Sauté the onion in the butter on medium heat until caramelized, about 20-30 minutes. While the onions are sautéing, preheat the oven to 450 degrees. Trim the stems off the mushrooms and rub them with the olive oil. Sprinkle the mushrooms with the garlic powder and place on a baking sheet. Roast the mushrooms for 10-12 minutes. (If you'd like your cheese melted, you can place the cheese on the mushrooms during the last 1-2 minutes of baking). Once the onions are caramelized, add the balsamic vinegar and cook for another minute until the vinegar thickens. Drain the excess liquid off the mushrooms then assemble them on the hamburger buns with the onions and tomato.