(TrendHunter.com) Shake Shack is introducing a new truffle-themed menu lineup that revolves around the brand-new real white truffle sauce. The burgers and fries from Shake Shack, which are already well-liked, match... (TrendHunter.com) Shake Shack is introducing a new truffle-themed menu lineup that revolves around the brand-new real white truffle sauce. The burgers and fries from Shake Shack, which are already well-liked, match...