Rub a lime wedge around the rim of each coupe glass, then dip in red sanding sugar and set aside to dry.

In a pitcher, combine the Midori, pineapple juice and fresh lime juice, stirring well; the mixture should look a deep, glowing green.

Refrigerate the base for at least 30 minutes so it is properly cold.

Just before serving, add the lemon-lime soda and stir once, gently.

Pour into the sugared coupe glasses and float a lime wheel on top of each.