Fill a glass with ice and swirl to chill the glass. Dump out the ice. Use a vegetable peeler to remove one 5-inch long strip of zest. Twist and squeeze the zest over the glass, then rub it around its rim. Reserve the lemon zest.
Fill the glass two-thirds with ice, then add the gin. Pour in the tonic along a spoon, then stir twice. Add the reserved zest and serve immediately.
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