A California burger joint has now added a new menu item. The Slash burger is now available at Umami Burger. What's on it? Shiitake mushrooms, caramelized onions, American cheese, avocado spread, and wasabi aioli, served with a Parmesan cheese crisp. What? Wasabi aioli? According to Henne Music, the burger costs $15, with $1 going to Los Angeles Youth Network. You can take a look at the burger below.

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