(TrendHunter.com) The Einstein Bros. Cold Brew Shakes are a new offering from the brand that will offer patrons with a tasty way to boost their energy throughout the day. The shakes come in three flavor options to... (TrendHunter.com) The Einstein Bros. Cold Brew Shakes are a new offering from the brand that will offer patrons with a tasty way to boost their energy throughout the day. The shakes come in three flavor options to...