Creamy orange creamsicle goodness in a refreshing and classic drink — make my Homemade Orange Soda Ice Cream Floats recipe now!
In a medium saucepan over medium heat, combine the orange juice, sugar, water, lemon juice, orange zest, and citric acid and let simmer for 10 minutes, stirring occasionally.
Turn off the heat and let the zest infuse in the syrup for an hour.
Strain the syrup with a fine mesh strainer into a lidded jar and refrigerate until chilled, about 3 hours and up to 1 month.
When ready to serve, fill glasses with 1 part syrup to 2 or 3 parts seltzer (depending on your taste), then top each serving with a few scoops of vanilla ice cream. Serve immediately.