Recipe courtesy of Chef Dan Long, MAD Greens
In a bowl, combine ground beef, lamb, chopped shiitake mushrooms, mushroom powder, Worcestershire sauce, salt and cracked pepper. Mix well and form into patties.
Cook on grill until prepared to your liking, adding cheese if desired.
Assemble on toasted brioche bun with Aioli, caramelized onions, arugula and other toppings as desired.
Garlic Aioli: Using food processor, blend all of the ingredients except the oil. Then slowly add the oil in a steady stream. This should take approximately 2 minutes.
*For the mushroom powder, take ¼ cup of dried mushrooms and use a spice grinder to grind them into a powder. (A mortar and pestle will work, too.)
**To caramelize the onions, add 1 teaspoon of olive oil to a saute pan on low heat. Add the sliced onion and cook until they turn translucent with slightly browned edges. This should take approximately 20-30 minutes.