1) Put lime juice, two leftover rinds, honey, serrano, and mint into a pitcher.
2) Take a wooden spoon or muddler and muddle the ingredients together.
3) Add tequila and grapefruit juice and stir to combine.
4) Rim each glass with some lime juice, and dip into a mixture of salt and chili powder. Pour enough ice into glass and fill your glass up with the margarita!
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