To make the mint fig syrup: add halved figs, mint leaves, sugar, and water to a small saucepan. Simmer gently for 5 minutes. Strain thoroughly in a fine mesh sieve over a jar or glass. Let cool at least 10 minutes.
Add ice to a cocktail glass. In a shaker, combined fig syrup, orange juice, whiskey, and bitters. Shake with ice until chilled and pour into prepared glass. Top with sparkling water. Garnish with fresh mint and figs, as desired.