Maple Caramelized Onion and Mushroom Burger with Red Onion Jam (Paleo / AIP)

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Oh, the burger. It remains, for me, among the most comforting of comfort food. Burgers and fries just seem synonymous with a good experience, no? Being something of a foodie, when I want a burger, I want something more than just your basic. A bit of glamour. A bit of pizazz.  Burgers have actually been …