People argue about the reality of umami, the supposed “fifth taste” discernible to the palate but not easily described by the brain. What’s indisputable is the reality of Umami Burger, a 14-unit Los Angeles-based premium burger concept that’s alternately described as distinct, groundbreaking, clever, trendy and pricey. Founder Adam Fleischman would likely add “expandable” to that list, as well. “This is a fast-casual concept we want to bring ...

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