Adam Fleischman

Resist the urge to pile on any of the usual toppings—lettuce, tomato, ketchup. "The port is your condiment," explains Umami Burger's Adam Fleischman.Tip: Burger purists handle ground meat as little as possible; over-working the beef can create a tight, meatloaf texture. Slideshow: More Great Burgers 
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At Adam Fleischman's expanding Los Angeles chain, the secret to his burgers is "umami dust," a combination of bonito (dried tuna) flakes, dried kombu (seaweed) and shiitake mushrooms with a pronounced savory Asian flavor. It makes a juicy burger taste even more deeply meaty.Tip: Burger purists handle ground meat as little as possible; over-working the beef can create a tight, meatloaf texture. Slideshow: More Great Burgers