Add the London dry gin, lime juice and a handful of ice to a copper mug. If you don't have a copper mug, a double old fashioned glass works.
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Using a bar spoon, stir the mixture until it's cold and condensation begins to form on the copper mug, about 15-20 seconds.
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Top with chilled ginger beer. Gently stir to combine. If desired, garnish with a lime slice or wheel. Enjoy!
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