McDonald’s Shamrock Shake Returns to Menus Nationwide | Eater
"The Shamrock Shake — an alarmingly green, minty seasonal shake that first appeared in 1970 — has returned nationwide as a St. Patrick’s Day tie-in. While the connection between mint flavoring and Ireland is unclear, the shake’s annual reappearance (typically four to five weeks before the start of spring) is treated as a more reliable sign of spring than Punxsutawney Phil." - Whitney Filloon
