Green Beer as we know it is not a coveted celebration secret passed down from generation to generation of Irish fathers to their sons. Green Beer was a term to reference beer that was not sufficient aged! "Green beer" is a term brewers still use today to describe beer that's too young (or "green"). True green beer still contains acetaldehyde, which can make beer taste bad because it's not yet fully fermented.
Green Beer as it is affectionately known was invented in...... America. That's right. Green Beer was invented in the same land that brought us duct tape, the toilet (inventor: Thomas Crapper), mobile phones, TV dinners, reality TV, the bra and cartoons. Green Beer is in good company.
The Green Beer is credited to Professor Thomas H. Curtin for his clubhouse in New York. This was as early as 1914. By the 1950s, green beer was a mainstream symbol of a holiday that was becoming less Irish and more American.
The video below is "Beer is good and stuff". Be responsible, obey all laws and have fun!