Grilled Beef and Mushroom Burger

"Hey dad, wanna come over for lunch? We're making mushroom burgers." Radio silence. That's weird. Usually an invitation for free food and the company of his firstborn is met with gleeful enthusiasm. "Don't worry, it's a beef burger, with lots of mushrooms, you'll love it." Bingo, that was it. "Okay, sure! We'll be right over." It used to be, "mushroom burger" just meant a hamburger with lots of mushrooms piled on top. These days it usually refers to a burger in which a portobello mush

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