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I had a Shack Attack concrete from Shake Shack! The Shack Attack contains chocolate custard, hot fudge, chocolate truffle cookie dough and Valrhona chocolate chunks, topped with chocolate sprinkles. My favorite part were the truffle cookie dough chunks, so decadent. Definitely recommended if you`re a chocolate lover.
This concrete flavor is exclusive to the Madison Sq Park location though, so if you`re visiting Shake Shack in NYC make sure you go to the one there! I also found that the Shake Shacks all have different concretes exclusive to their respective locations as well, which is nice but also inconvenient.
photos are my own