Look no further than these large-batch margaritas when you're hosting your next big fiesta and can't spend hours juicing limes. This margarita recipe is a revelation--the secret ingredient is a can of frozen limeade concentrate which, once emptied, doubles as a measuring cup for the remaining ingredients. These margaritas are strong, slightly (but not overly) sweet, and have the perfect note of orange flavor. Oh, and did we mention there's beer involved? We prefer to serve in a large glass drink dispenser with plenty of limes on the side.