Tried Umami a few days ago. Pleasant space on Union at Fillmore. I naively tried to order a burger with cheese and onions only. I was very nicely informed that the owner/chef (or something like that) didn’t allow changes/substitutions to the burger menu.
At that point I should have abandoned ship, but instead ordered their most “plain” burger which was one with a roasted tomato, shitake mushroom, caramelized onion and a Parmesan crisp. I think the meat itself was pretty good and the bun was great. Unfortunately, the crisp wasn’t, the tomato tasted a bit soggy and slightly odd and the mushroom was lost in mix. They have their own ketchup that is very, very sweet and didn’t taste very good to me.
The fries were crispy and a little too salty, but the real problem is the potato taste didn’t come through.