The Perfect Margarita

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• 1 wedge lime

• 1 teaspoon coarse sea salt, or as needed

• 1 large ice cube

• 1 cup ice cubes, or as needed

• 2 fluid ounces white tequila

• 1 ½ fluid ounces triple sec

• 1 fluid ounce freshly squeezed lime juice

• 1 slice lime