What flavor is Shamrock Shake? This question has been on the minds of many fans of the popular fast-food treat every St. Patrick’s Day. The Shamrock Shake, a seasonal favorite from McDonald’s, is a creamy, mint-flavored milkshake that is as iconic as the holiday itself. Its unique taste and vibrant green color have made it a staple in the hearts of many, but what exactly is the secret behind this delightful flavor? Let’s dive into the world of Shamrock Shake and uncover the mystery of its taste.