For this drink, Best uses yellow Chartreuse--an herbal liqueur flavored with saffron and honey. Substitute Strega, an Italian herbal liqueur, if you wish.
Bring sugar and 4 ounces water to a boil in a small saucepan, stirring to dissolve sugar. Add pineapple juice; reduce heat, and simmer 10 minutes. Reduce heat to low; add sage, and steep 5 minutes. Remove from heat; strain and discard solids. Cool to room temperature.
Combine pineapple syrup, rum, lime juice, and Chartreuse in a pitcher. To serve, pour 6 ounces rum mixture into a shaker filled with ice. Shake well, and strain into a glass. Garnish with a lime slice. Repeat procedure with remaining rum mixture, ice, and lime slices.