when did mcdonald's start selling shamrock shakes
Shamrock Shake The Shamrock Shake was first introduced in 1970.[1] Rogers Merchandising in Chicago created the shake. Initially, the shake was lemon/lime flavored with vanilla ice cream, lemon/lime sherbet, and vanilla syrup. By 1973, the shake was merely a green colored vanilla shake, eliminating the lemon/lime sherbet. It is now mint flavored.