In a blender, add grapefruit juice, tequila, triple sec, agave, and ice. Pulse until slushy.
Add a couple grapefruit slices to bottom of margarita glass.
Pour in cocktail mixture to glass.
Add a few ounces of beer to almost fill glass and leave bottle in glass (glass will not overfill unless bottle is lifted up past top of liquid in glass).
Garnish rim with grapefruit slice.
Keyword alcohol
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