1. Start with a light colored beer or ale. The lighter the beer, the brighter the green color. Darker beer needs more food coloring to get the same green. But be careful: Too much food coloring and you’ll end up with green teeth! On the bright side, you won't be getting punched for not wearing green.
   
   
2. Grab a large frosty beer mug. Squeeze in 3 to 5 drops of green food coloring. Slowly pour beer from a 12-ounce can or a 16-ounce bottle into the glass. If you want more color, just add a drop or two more food coloring. Be sure not to put the beer in first; you'll end up stirring the beer and making it go flat. Talk about a buzz kill!
   
   
3. Stick with green. For the best color, only use green food coloring, not blue.

Slainte! (Gaelic for "Cheers!")