
Who knew a burger this good could be good for you too. The key? Blending mushrooms into the mix, which adds umami, moisture, and goes totally under the radar as far as flavor goes. It's delicious.
Set a large non-stick or cast iron skillet over medium-high. When the pan is hot, add the mushrooms. Saute until the mushrooms release their liquid and it evaporates from the pan, 4 to 5 minutes. The mushrooms will turn tender and darken.
Transfer the mushrooms to a bowl with the ground beef, the 1/2 teaspoon salt, and several grinds of black pepper. When cool enough to handle, use your hands to mix the mushrooms and meat evenly together. Try not to overwork the mixture. Form into 5 patties and season the outside with with a little more salt and pepper.
Dress up your burger however you like, bun or no bun, ketchup, pickles and all the rest of it.