"Boozy frappes have always been a staple at this rapidly growing international burger chain with Boston roots. Birthday cake and mud pie are on the currently flavor list, each spiked with vanilla vodka. Wahlburgers also has plenty of non-boozy shakes. There are Massachusetts locations in Boston (Fenway, Dorchester, and the airport), Hingham, Lynnfield, and Springfield." - Rachel Leah Blumenthal