Get all of the items you need to make your drink ready to go.
Fill up your shaker and highball glass with ice.
Measure up 2 oz of Gin with the jigger and toss into the highball glass.
Measure up 2 oz of orange juice with the jigger and toss into the highball glass.
Measure up 4 oz of Tonic Water with the jigger and toss into the highball glass.note: or, you can skip measuring and just just top the glass off with the tonic water. Add a few dashes of orange bitters to the glass.
Gently dump the contents of the glass into the shaker and then from the shaker back into the glass.
optional garnish: You can cut a wheel or wedge of orange, cut a notch in the pulp and add it to the rim of the glass.