Add three drops food coloring to a 16-ounce beer mug or pint glass.
Pour beer into glass.
Serve immediately. Enjoy!
Notes
For best results, use light-colored beers, such as a pilsners, IPAs, and pale ales.I found that three drops of food coloring was perfect, but you can add a drop or two more for a deeper color.To make a pitcher of green beer, add three drops for every 12 ounces that your pitcher holds. For example, if you have a 48-ounce pitcher, add 12 drops. For a 60 ounce pitcher, add 15 drips. Again, you can add more drops, if needed.