McCafe Shamrock Shakes are made from reduced-fat vanilla ice cream and Shamrock Shake syrup, according to McDonald's. The shake is topped with whipped cream and a maraschino cherry.
McDonald's minty, pale green Shamrock Shake is a popular springtime seasonal beverage created in celebration of St. Patrick's Day. The drink is created by blending vanilla ice cream with Shamrock Shake syrup, which includes high fructose corn syrup, water, sugar and natural flavor. The blended shake is accented with whipped cream and a cherry. Originally introduced in 1970, the Shamrock Shake is now part of McDonald's McCafe line of upscale shakes and coffee beverages.