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Not going to rate the atmosphere because they are currently functioning as a canopied pop-up directly in front of their soon opening brick & mortar spot on Burbank Blvd;
catty-corner from Valley College. That said, I tried the double cheeseburger to-go because for me, that is the anchor menu item for any smash burger joint; and I was very pleased with the result. The meat was seasoned and exhibited all the caramelization you'd want in a smash and the sliced, grilled-to-perfection onions with an excellent melted cheese combined to produce a well executed double cheeseburger.