These richly flavored burgers will fool no one but please many. Roasted mushrooms, toasted pecans, soy sauce, Parmesan, and porcini powder make for a flavor profile that is, if not meaty, supremely savory.
Preheat the oven to 425°F. Toss together on a large baking sheet:
Save the stems for stock. Roast the mushrooms until well browned and shriveled, 20 to 25 minutes. Meanwhile, heat in a medium skillet over medium heat:
Add and cook, stirring, until softened, about 5 minutes:
Stir in and cook 2 minutes more:
In a large bowl, mash until no whole beans remain:
Stir in the mushroom/onion mixture, along with:
Mix well with your hands until the mixture is combined and holds together when squeezed. Shape into 4 patties. Cook as for Beet Burgers. Serve with any of the additions to hamburgers.