Instructions
Muddle passion fruit syrup and limes. Add remaining ingredients and ice, shake and pour (don't strain) into an Old Fashioned glass.
Notes
I used passion fruit syrup since it’s far easier to come by than fresh passion fruit. If you’re able to get a hold of fresh passion fruit, add 1/2 a fresh passion fruit to recipe and sub the passion fruit syrup for simple syrup or 3 tsp super fine sugar.