Peel 10 strips of lime with a julienne slicer/mandoline slicer.Place the lime strips in a glass, and use a muddler to press the oils out of the peel, but avoid pressing too hard, as it can become bitter.Pour gin over, and add ice cubes.Add tonic, and stir gently.If you don't have a julienne slicer, you can cut strips with a knife, but avoid the white part.