Fruit Salad in Orange Syrup

In a medium saucepan, combine water and sugar over medium-high heat; stir until sugar dissolves. Add orange zest; bring to a boil, reduce heat to medium, and simmer for 5 minutes.

Strain syrup, discarding solids; let cool completely. Stir in almond liqueur, if desired. Store in an airtight container for up to 2 weeks.