According to McDonald’s, the Shamrock Shake was invented in 1967 by a McDonald’s owner/operator based in Connecticut named Hal Rosen. The mint shake, of course intended to celebrate St. Patrick’s Day, ...
Shamrock Shakes debuted in 1970 after being created by Hal Rosen, a Connecticut franchisee who was looking for something to draw customers around St. Patrick’s Day in the mid-to late-’60s.
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