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It looks sort of like a psychedelic preschool, all Day-Glo colors and funky signs and crowdsourced artwork, but this small Philadelphia burger joint serves up an exquisitely simple, highly flavorful 8-ounce sirloin burger, served on a doughy white bun from a local bakery with sliced tomato, shredded lettuce, and a choice of sauces — among them hot mustard, BBQ, harissa aïoli, and (a surprising retro choice) green goddess. Sketch also serves a smashed onion burger, a truffle butter burger, and a Cyclops burger (with bacon and a fried egg), but why would you tamper with elementary success?

-Colman Andrews